patch: compile for for diffutils 2.8.1 on HP-UX / ia64

[Petter Reinholdtsen]

The latest version of diffutils I am aware of, version 2.8,1, fail to
build on HP-UX/ia64.  This is the error message:

  cc-wrapper -DLOCALEDIR=\"/local/share/locale\" -DHAVE_CONFIG_H
    -I. -I. -I..  -I../lib -I../lib -g -c `test -f diff.c || echo
    './'`diff.c
  Error 628: "diff.h", line 135 # "re_pattern_buffer
    function_regexp" ["diff.h", line 135] cannot be defined to have an
    incomplete type.
      XTERN struct re_pattern_buffer function_regexp;
                                     ^^^^^^^^^^^^^^^
  Error 628: "diff.h", line 138 # "re_pattern_buffer ignore_regexp"
    ["diff.h", line 138] cannot be defined to have an incomplete type.
      XTERN struct re_pattern_buffer ignore_regexp;
                                     ^^^^^^^^^^^^^
  Warning 863: "diff.c", line 799 # Result of operator << is widened
    from int to unsigned long.
            reglist->buf->fastmap = xmalloc (1 << CHAR_BIT);
                                             ^^^^^^^^^^^^^

The fix is to make sure <regex.h> (from ../lib/regex/) is included
when the struct is needed in diff.h.  This patch fixed the compile
problem:

diff -ur src-2.8.1/src/diff.h src-2.8.1-local/src/diff.h
--- src-2.8.1/src/diff.h        2002-03-11 22:24:42.000000000 +0100
+++ src-2.8.1-local/src/diff.h  2004-03-30 12:50:40.000000000 +0200
@@ -22,6 +22,7 @@

 #include "system.h"
 #include <stdio.h>
+#include <regex.h> /* for struct re_pattern_buffer on HP-UX/ia64 */

 #define TAB_WIDTH 8

Please include it in a future version of diffutils.