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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: main.c,v 1.75 2015/03/19 21:22:15 bcallah Exp $	*/

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

/*
 *	Mainline.
 */

#include <sys/queue.h>
#include <err.h>
#include <limits.h>
#include <locale.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "def.h"
#include "kbd.h"
#include "funmap.h"
#include "macro.h"

int		 thisflag;			/* flags, this command	*/
int		 lastflag;			/* flags, last command	*/
int		 curgoal;			/* goal column		*/
int		 startrow;			/* row to start		*/
int		 doaudiblebell;			/* audible bell toggle	*/
int		 dovisiblebell;			/* visible bell toggle	*/
struct buffer	*curbp;				/* current buffer	*/
struct buffer	*bheadp;			/* BUFFER list head	*/
struct mgwin	*curwp;				/* current window	*/
struct mgwin	*wheadp;			/* MGWIN listhead	*/
char		 pat[NPAT];			/* pattern		*/

static void	 edinit(struct buffer *);
static __dead void usage(void);

extern char	*__progname;
extern void     closetags(void);

static __dead void
usage()
{
	fprintf(stderr, "usage: %s [-n] [-f mode] [+number] [file ...]\n",
	    __progname);
	exit(1);
}

int
main(int argc, char **argv)
{
	char		*cp, *init_fcn_name = NULL;
	PF		 init_fcn = NULL;
	int	 	 o, i, nfiles;
	int	  	 nobackups = 0;
	struct buffer	*bp = NULL;

	while ((o = getopt(argc, argv, "nf:")) != -1)
		switch (o) {
		case 'n':
			nobackups = 1;
			break;
		case 'f':
			if (init_fcn_name != NULL)
				errx(1, "cannot specify more than one "
				    "initial function");
			init_fcn_name = optarg;
			break;
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	setlocale(LC_CTYPE, "");

	maps_init();		/* Keymaps and modes.		*/
	funmap_init();		/* Functions.			*/

	/*
	 * This is where we initialize standalone extensions that should
	 * be loaded dynamically sometime in the future.
	 */
	{
		extern void grep_init(void);
		extern void theo_init(void);
		extern void cmode_init(void);
		extern void dired_init(void);

		dired_init();
		grep_init();
		theo_init();
		cmode_init();
	}

	if (init_fcn_name &&
	    (init_fcn = name_function(init_fcn_name)) == NULL)
		errx(1, "Unknown function `%s'", init_fcn_name);

	vtinit();		/* Virtual terminal.		*/
	dirinit();		/* Get current directory.	*/
	edinit(bp);		/* Buffers, windows.		*/
	ttykeymapinit();	/* Symbols, bindings.		*/
	bellinit();		/* Audible and visible bell.	*/

	/*
	 * doing update() before reading files causes the error messages from
	 * the file I/O show up on the screen.	(and also an extra display of
	 * the mode line if there are files specified on the command line.)
	 */
	update(CMODE);

	/* user startup file. */
	if ((cp = startupfile(NULL)) != NULL)
		(void)load(cp);

	/* 
	 * Now ensure any default buffer modes from the startup file are
	 * given to any files opened when parsing the startup file.
	 * Note *scratch* will also be updated.
	 */
	for (bp = bheadp; bp != NULL; bp = bp->b_bufp) {
		bp->b_flag = defb_flag;
		for (i = 0; i <= defb_nmodes; i++) {
                	bp->b_modes[i] = defb_modes[i];
        	}
	}

	/* Force FFOTHARG=1 so that this mode is enabled, not simply toggled */
	if (init_fcn)
		init_fcn(FFOTHARG, 1);

	if (nobackups)
		makebkfile(FFARG, 0);

	for (nfiles = 0, i = 0; i < argc; i++) {
		if (argv[i][0] == '+' && strlen(argv[i]) >= 2) {
			long long lval;
			const char *errstr;

			lval = strtonum(&argv[i][1], INT_MIN, INT_MAX, &errstr);
			if (argv[i][1] == '\0' || errstr != NULL)
				goto notnum;
			startrow = lval;
		} else {
notnum:
			cp = adjustname(argv[i], FALSE);
			if (cp != NULL) {
				if (nfiles == 1)
					splitwind(0, 1);

				if ((curbp = findbuffer(cp)) == NULL) {
					vttidy();
					errx(1, "Can't find current buffer!");
				}
				(void)showbuffer(curbp, curwp, 0);
				if (readin(cp) != TRUE)
					killbuffer(curbp);
				else {
					/* Ensure enabled, not just toggled */
					if (init_fcn_name)
						init_fcn(FFOTHARG, 1);
					nfiles++;
				}
			}
		}
	}

	if (nfiles > 2)
		listbuffers(0, 1);

	/* fake last flags */
	thisflag = 0;
	for (;;) {
		if (epresf == KCLEAR)
			eerase();
		if (epresf == TRUE)
			epresf = KCLEAR;
		if (winch_flag) {
			do_redraw(0, 0, TRUE);
			winch_flag = 0;
		}
		update(CMODE);
		lastflag = thisflag;
		thisflag = 0;

		switch (doin()) {
		case TRUE:
			break;
		case ABORT:
			ewprintf("Quit");
			/* FALLTHRU */
		case FALSE:
		default:
			macrodef = FALSE;
		}
	}
}

/*
 * Initialize default buffer and window. Default buffer is called *scratch*.
 */
static void
edinit(struct buffer *bp)
{
	struct mgwin	*wp;

	bheadp = NULL;
	bp = bfind("*scratch*", TRUE);		/* Text buffer.          */
	if (bp == NULL)
		panic("edinit");

	wp = new_window(bp);
	if (wp == NULL)
		panic("edinit: Out of memory");

	curbp = bp;				/* Current buffer.	 */
	wheadp = wp;
	curwp = wp;
	wp->w_wndp = NULL;			/* Initialize window.	 */
	wp->w_linep = wp->w_dotp = bp->b_headp;
	wp->w_ntrows = nrow - 2;		/* 2 = mode, echo.	 */
	wp->w_rflag = WFMODE | WFFULL;		/* Full.		 */
}

/*
 * Quit command.  If an argument, always quit.  Otherwise confirm if a buffer
 * has been changed and not written out.  Normally bound to "C-X C-C".
 */
/* ARGSUSED */
int
quit(int f, int n)
{
	int	 s;

	if ((s = anycb(FALSE)) == ABORT)
		return (ABORT);
	if (s == FIOERR || s == UERROR)
		return (FALSE);
	if (s == FALSE
	    || eyesno("Modified buffers exist; really exit") == TRUE) {
		vttidy();
		closetags();
		exit(0);
	}
	return (TRUE);
}

/*
 * User abort.  Should be called by any input routine that sees a C-g to abort
 * whatever C-g is aborting these days. Currently does nothing.
 */
/* ARGSUSED */
int
ctrlg(int f, int n)
{
	return (ABORT);
}