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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: autoexec.c,v 1.16 2015/03/19 21:22:15 bcallah Exp $ */
/* this file is in the public domain */
/* Author: Vincent Labrecque <vincent@openbsd.org>	April 2002 */

#include <sys/queue.h>
#include <fnmatch.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "def.h"
#include "funmap.h"

struct autoexec {
	SLIST_ENTRY(autoexec) next;	/* link in the linked list */
	const char	*pattern;	/* Pattern to match to filenames */
	PF		 fp;
};

static SLIST_HEAD(, autoexec)	 autos;
static int			 ready;


#define AUTO_GROW 8
/*
 * Return a NULL terminated array of function pointers to be called
 * when we open a file that matches <fname>.  The list must be free(ed)
 * after use.
 */
PF *
find_autoexec(const char *fname)
{
	PF		*pfl, *npfl;
	int		 have, used;
	struct autoexec *ae;

	if (!ready)
		return (NULL);

	pfl = NULL;
	have = 0;
	used = 0;
	SLIST_FOREACH(ae, &autos, next) {
		if (fnmatch(ae->pattern, fname, 0) == 0) {
			if (used >= have) {
				npfl = reallocarray(pfl, have + AUTO_GROW + 1,
				    sizeof(PF));
				if (npfl == NULL)
					panic("out of memory");
				pfl = npfl;
				have += AUTO_GROW;
			}
			pfl[used++] = ae->fp;
		}
	}
	if (used)
		pfl[used] = NULL;

	return (pfl);
}

int
add_autoexec(const char *pattern, const char *func)
{
	PF		 fp;
	struct autoexec *ae;

	if (!ready) {
		SLIST_INIT(&autos);
		ready = 1;
	}
	fp = name_function(func);
	if (fp == NULL)
		return (FALSE);
	ae = malloc(sizeof(*ae));
	if (ae == NULL)
		return (FALSE);
	ae->fp = fp;
	ae->pattern = strdup(pattern);
	if (ae->pattern == NULL) {
		free(ae);
		return (FALSE);
	}
	SLIST_INSERT_HEAD(&autos, ae, next);

	return (TRUE);
}

/*
 * Register an auto-execute hook; that is, specify a filename pattern
 * (conforming to the shell's filename globbing rules) and an associated
 * function to execute when a file matching the specified pattern
 * is read into a buffer. 
*/
/* ARGSUSED */
int
auto_execute(int f, int n)
{
	char	patbuf[128], funcbuf[128], *patp, *funcp;
	int	s;

	if ((patp = eread("Filename pattern: ", patbuf, sizeof(patbuf),
	    EFNEW | EFCR)) == NULL)
		return (ABORT);
	else if (patp[0] == '\0')
		return (FALSE);
	if ((funcp = eread("Execute: ", funcbuf, sizeof(funcbuf),
	    EFNEW | EFCR | EFFUNC)) == NULL)
		return (ABORT);
	else if (funcp[0] == '\0')
		return (FALSE);
	if ((s = add_autoexec(patp, funcp)) != TRUE)
		return (s);
	return (TRUE);
}