Add a patch to fix build error on emacs 25.3

Author: takaxp

fix-emacs25.3-unexmacosx.c.patch

@@ -0,0 +1,108 @@
+diff --git a/src/unexmacosx.c b/src/unexmacosx.c
+index 53a30e3627..59cbe3c18b 100644
+--- a/src/unexmacosx.c
++++ b/src/unexmacosx.c
+@@ -1,5 +1,5 @@
+ /* Dump Emacs in Mach-O format for use on macOS.
+-   Copyright (C) 2001-2017 Free Software Foundation, Inc.
++   Copyright (C) 2001-2020 Free Software Foundation, Inc.
+ 
+ This file is part of GNU Emacs.
+ 
+@@ -97,9 +97,9 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
+ 
+ #include "unexec.h"
+ #include "lisp.h"
++#include "sysstdio.h"
+ 
+ #include <errno.h>
+-#include <stdio.h>
+ #include <fcntl.h>
+ #include <stdarg.h>
+ #include <stdint.h>
+@@ -303,9 +303,9 @@ unexec_error (const char *format, ...)
+   va_list ap;
+ 
+   va_start (ap, format);
+-  fprintf (stderr, "unexec: ");
++  fputs ("unexec: ", stderr);
+   vfprintf (stderr, format, ap);
+-  fprintf (stderr, "\n");
++  putc ('\n', stderr);
+   va_end (ap);
+   exit (1);
+ }
+@@ -447,7 +447,7 @@ unexec_regions_recorder (task_t task, void *rr, unsigned type,
+ 
+   while (num && num_unexec_regions < MAX_UNEXEC_REGIONS)
+     {
+-      /* Subtract the size of trailing null bytes from filesize.  It
++      /* Subtract the size of trailing NUL bytes from filesize.  It
+ 	 can be smaller than vmsize in segment commands.  In such a
+ 	 case, trailing bytes are initialized with zeros.  */
+       for (p = ranges->address + ranges->size; p > ranges->address; p--)
+@@ -503,22 +503,34 @@ unexec_regions_sort_compare (const void *a, const void *b)
+ static void
+ unexec_regions_merge (void)
+ {
+-  int i, n;
+-  unexec_region_info r;
+-  vm_size_t padsize;
+-
+   qsort (unexec_regions, num_unexec_regions, sizeof (unexec_regions[0]),
+ 	 &unexec_regions_sort_compare);
+-  n = 0;
+-  r = unexec_regions[0];
+-  padsize = r.range.address & (pagesize - 1);
+-  if (padsize)
++
++  /* Align each region start address to a page boundary.  */
++  for (unexec_region_info *cur = unexec_regions;
++       cur < unexec_regions + num_unexec_regions; cur++)
+     {
+-      r.range.address -= padsize;
+-      r.range.size += padsize;
+-      r.filesize += padsize;
++      vm_size_t padsize = cur->range.address & (pagesize - 1);
++      if (padsize)
++	{
++	  cur->range.address -= padsize;
++	  cur->range.size += padsize;
++	  cur->filesize += padsize;
++
++	  unexec_region_info *prev = cur == unexec_regions ? NULL : cur - 1;
++	  if (prev
++	      && prev->range.address + prev->range.size > cur->range.address)
++	    {
++	      prev->range.size = cur->range.address - prev->range.address;
++	      if (prev->filesize > prev->range.size)
++		prev->filesize = prev->range.size;
++	    }
++	}
+     }
+-  for (i = 1; i < num_unexec_regions; i++)
++
++  int n = 0;
++  unexec_region_info r = unexec_regions[0];
++  for (int i = 1; i < num_unexec_regions; i++)
+     {
+       if (r.range.address + r.range.size == unexec_regions[i].range.address
+ 	  && r.range.size - r.filesize < 2 * pagesize)
+@@ -530,17 +542,6 @@ unexec_regions_merge (void)
+ 	{
+ 	  unexec_regions[n++] = r;
+ 	  r = unexec_regions[i];
+-	  padsize = r.range.address & (pagesize - 1);
+-	  if (padsize)
+-	    {
+-	      if ((unexec_regions[n-1].range.address
+-		   + unexec_regions[n-1].range.size) == r.range.address)
+-		unexec_regions[n-1].range.size -= padsize;
+-
+-	      r.range.address -= padsize;
+-	      r.range.size += padsize;
+-	      r.filesize += padsize;
+-	    }
+ 	}
+     }
+   unexec_regions[n++] = r;