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Clean up the includes in mg.
This does the following:
Moves all POSIX headers from sysdef.h into the individual .c files so that
each file now only includes what it needs. All headers are properly sorted.
Moves the remainder of sysdef.h to other files (mostly def.h) and deletes
sysdef.h now that it's no longer contains anything.
Tweak a comment that references sysdef.h so that it no longer does that.
ok florian@

/*	$OpenBSD: paragraph.c,v 1.36 2015/03/19 21:22:15 bcallah Exp $	*/

/* This file is in the public domain. */

/*
 * Code for dealing with paragraphs and filling. Adapted from MicroEMACS 3.6
 * and GNU-ified by mwm@ucbvax.	 Several bug fixes by blarson@usc-oberon.
 */

#include <sys/queue.h>
#include <ctype.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>

#include "def.h"

static int	fillcol = 70;

#define MAXWORD 256

/*
 * Move to start of paragraph.
 * Move backwards by line, checking from the 1st character forwards for the
 * existence a non-space. If a non-space character is found, move to the 
 * preceding line. Keep doing this until a line with only spaces is found or
 * the start of buffer.
 */
/* ARGSUSED */
int
gotobop(int f, int n)
{
	int col, nospace;

	/* the other way... */
	if (n < 0)
		return (gotoeop(f, -n));

	while (n-- > 0) {
		nospace = 0;
		while (lback(curwp->w_dotp) != curbp->b_headp) {
			curwp->w_doto = 0;
			col = 0;

			while (col < llength(curwp->w_dotp) &&
			    (isspace(lgetc(curwp->w_dotp, col))))
				col++;

			if (col >= llength(curwp->w_dotp)) {
				if (nospace)
					break;
			} else
				nospace = 1;

			curwp->w_dotline--;
			curwp->w_dotp = lback(curwp->w_dotp);
		}
	}
	/* force screen update */
	curwp->w_rflag |= WFMOVE;
	return (TRUE);
}

/*
 * Move to end of paragraph.
 * See comments for gotobop(). Same, but moving forwards.
 */
/* ARGSUSED */
int
gotoeop(int f, int n)
{
	int col, nospace;

	/* the other way... */
	if (n < 0)
		return (gotobop(f, -n));

	/* for each one asked for */
	while (n-- > 0) {
		nospace = 0;
		while (lforw(curwp->w_dotp) != curbp->b_headp) {
			col = 0;
			curwp->w_doto = 0;

			while (col < llength(curwp->w_dotp) &&
			    (isspace(lgetc(curwp->w_dotp, col))))
				col++;

			if (col >= llength(curwp->w_dotp)) {
				if (nospace)
					break;
			} else
				nospace = 1;

			curwp->w_dotp = lforw(curwp->w_dotp);
			curwp->w_dotline++;

			/* do not continue after end of buffer */
			if (lforw(curwp->w_dotp) == curbp->b_headp) {
				gotoeol(FFRAND, 1);
				curwp->w_rflag |= WFMOVE;
				return (FALSE);
			}
		}
	}

	/* force screen update */
	curwp->w_rflag |= WFMOVE;
	return (TRUE);
}

/*
 * Justify a paragraph.  Fill the current paragraph according to the current
 * fill column.
 */
/* ARGSUSED */
int
fillpara(int f, int n)
{
	int	 c;		/* current char during scan		*/
	int	 wordlen;	/* length of current word		*/
	int	 clength;	/* position on line during fill		*/
	int	 i;		/* index during word copy		*/
	int	 eopflag;	/* Are we at the End-Of-Paragraph?	*/
	int	 firstflag;	/* first word? (needs no space)		*/
	int	 newlength;	/* tentative new line length		*/
	int	 eolflag;	/* was at end of line			*/
	int	 retval;	/* return value				*/
	struct line	*eopline;	/* pointer to line just past EOP	*/
	char	 wbuf[MAXWORD];	/* buffer for current word		*/

	undo_boundary_enable(FFRAND, 0);

	/* record the pointer to the line just past the EOP */
	(void)gotoeop(FFRAND, 1);
	if (curwp->w_doto != 0) {
		/* paragraph ends at end of buffer */
		(void)lnewline();
		eopline = lforw(curwp->w_dotp);
	} else
		eopline = curwp->w_dotp;

	/* and back top the begining of the paragraph */
	(void)gotobop(FFRAND, 1);

	/* initialize various info */
	while (inword() == 0 && forwchar(FFRAND, 1));

	clength = curwp->w_doto;
	wordlen = 0;

	/* scan through lines, filling words */
	firstflag = TRUE;
	eopflag = FALSE;
	while (!eopflag) {

		/* get the next character in the paragraph */
		if ((eolflag = (curwp->w_doto == llength(curwp->w_dotp)))) {
			c = ' ';
			if (lforw(curwp->w_dotp) == eopline)
				eopflag = TRUE;
		} else
			c = lgetc(curwp->w_dotp, curwp->w_doto);

		/* and then delete it */
		if (ldelete((RSIZE) 1, KNONE) == FALSE && !eopflag) {
			retval = FALSE;
			goto cleanup;
		}

		/* if not a separator, just add it in */
		if (c != ' ' && c != '\t') {
			if (wordlen < MAXWORD - 1)
				wbuf[wordlen++] = c;
			else {
				/*
				 * You lose chars beyond MAXWORD if the word
				 * is too long. I'm too lazy to fix it now; it
				 * just silently truncated the word before,
				 * so I get to feel smug.
				 */
				ewprintf("Word too long!");
			}
		} else if (wordlen) {

			/* calculate tentative new length with word added */
			newlength = clength + 1 + wordlen;

			/*
			 * if at end of line or at doublespace and previous
			 * character was one of '.','?','!' doublespace here.
			 * behave the same way if a ')' is preceded by a
			 * [.?!] and followed by a doublespace.
			 */
			if ((eolflag ||
			    curwp->w_doto == llength(curwp->w_dotp) ||
			    (c = lgetc(curwp->w_dotp, curwp->w_doto)) == ' '
			    || c == '\t') && (ISEOSP(wbuf[wordlen - 1]) ||
			    (wbuf[wordlen - 1] == ')' && wordlen >= 2 &&
			    ISEOSP(wbuf[wordlen - 2]))) &&
			    wordlen < MAXWORD - 1)
				wbuf[wordlen++] = ' ';

			/* at a word break with a word waiting */
			if (newlength <= fillcol) {
				/* add word to current line */
				if (!firstflag) {
					(void)linsert(1, ' ');
					++clength;
				}
				firstflag = FALSE;
			} else {
				if (curwp->w_doto > 0 &&
				    lgetc(curwp->w_dotp, curwp->w_doto - 1) == ' ') {
					curwp->w_doto -= 1;
					(void)ldelete((RSIZE) 1, KNONE);
				}
				/* start a new line */
				(void)lnewline();
				clength = 0;
			}

			/* and add the word in in either case */
			for (i = 0; i < wordlen; i++) {
				(void)linsert(1, wbuf[i]);
				++clength;
			}
			wordlen = 0;
		}
	}
	/* and add a last newline for the end of our new paragraph */
	(void)lnewline();

	/*
	 * We really should wind up where we started, (which is hard to keep
	 * track of) but I think the end of the last line is better than the
	 * beginning of the blank line.
	 */
	(void)backchar(FFRAND, 1);
	retval = TRUE;
cleanup:
	undo_boundary_enable(FFRAND, 1);
	return (retval);
}

/*
 * Delete a paragraph.  Delete n paragraphs starting with the current one.
 */
/* ARGSUSED */
int
killpara(int f, int n)
{
	int	status, end = FALSE;	/* returned status of functions */

	/* for each paragraph to delete */
	while (n--) {

		/* mark out the end and beginning of the para to delete */
		if (!gotoeop(FFRAND, 1))
			end = TRUE;

		/* set the mark here */
		curwp->w_markp = curwp->w_dotp;
		curwp->w_marko = curwp->w_doto;

		/* go to the beginning of the paragraph */
		(void)gotobop(FFRAND, 1);

		/* force us to the beginning of line */
		curwp->w_doto = 0;

		/* and delete it */
		if ((status = killregion(FFRAND, 1)) != TRUE)
			return (status);

		if (end)
			return (TRUE);
	}
	return (TRUE);
}

/*
 * Insert char with work wrap.  Check to see if we're past fillcol, and if so,
 * justify this line.  As a last step, justify the line.
 */
/* ARGSUSED */
int
fillword(int f, int n)
{
	char	c;
	int	col, i, nce;

	for (i = col = 0; col <= fillcol; ++i, ++col) {
		if (i == curwp->w_doto)
			return selfinsert(f, n);
		c = lgetc(curwp->w_dotp, i);
		if (c == '\t'
#ifdef NOTAB
		    && !(curbp->b_flag & BFNOTAB)
#endif
			)
			col |= 0x07;
		else if (ISCTRL(c) != FALSE)
			++col;
	}
	if (curwp->w_doto != llength(curwp->w_dotp)) {
		(void)selfinsert(f, n);
		nce = llength(curwp->w_dotp) - curwp->w_doto;
	} else
		nce = 0;
	curwp->w_doto = i;

	if ((c = lgetc(curwp->w_dotp, curwp->w_doto)) != ' ' && c != '\t')
		do {
			(void)backchar(FFRAND, 1);
		} while ((c = lgetc(curwp->w_dotp, curwp->w_doto)) != ' ' &&
		    c != '\t' && curwp->w_doto > 0);

	if (curwp->w_doto == 0)
		do {
			(void)forwchar(FFRAND, 1);
		} while ((c = lgetc(curwp->w_dotp, curwp->w_doto)) != ' ' &&
		    c != '\t' && curwp->w_doto < llength(curwp->w_dotp));

	(void)delwhite(FFRAND, 1);
	(void)lnewline();
	i = llength(curwp->w_dotp) - nce;
	curwp->w_doto = i > 0 ? i : 0;
	curwp->w_rflag |= WFMOVE;
	if (nce == 0 && curwp->w_doto != 0)
		return (fillword(f, n));
	return (TRUE);
}

/*
 * Set fill column to n for justify.
 */
int
setfillcol(int f, int n)
{
	char buf[32], *rep;
	const char *es;
	int nfill;

	if ((f & FFARG) != 0) {
		fillcol = n;
	} else {
		if ((rep = eread("Set fill-column: ", buf, sizeof(buf),
		    EFNEW | EFCR)) == NULL)
			return (ABORT);
		else if (rep[0] == '\0')
			return (FALSE);
		nfill = strtonum(rep, 0, INT_MAX, &es);
		if (es != NULL) {
			dobeep();
			ewprintf("Invalid fill column: %s", rep);
			return (FALSE);
		}
		fillcol = nfill;
		ewprintf("Fill column set to %d", fillcol);
	}
	return (TRUE);
}