[PATCH/RFC v2 2/3] compat/regex: get the gawk regex engine to compile within git

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

We need to define -DGAWK -DNO_MBSUPPORT so that the gawk regex engine
will compile, and include stdio.h and stddef.h in regex.h. Gawk itself
includes these headers before it includes the regex.h header.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 Makefile             |    4 ++++
 compat/regex/regex.h |    3 +++
 2 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/Makefile b/Makefile
index b4745a5..23a9f0d 100644
--- a/Makefile
+++ b/Makefile
@@ -1879,6 +1879,10 @@ ifdef NO_EXPAT
 http-walker.s http-walker.o: EXTRA_CPPFLAGS = -DNO_EXPAT
 endif
 
+ifdef NO_REGEX
+compat/regex/regex.o: EXTRA_CPPFLAGS = -DGAWK -DNO_MBSUPPORT
+endif
+
 git-%$X: %.o $(GITLIBS)
 	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
 
diff --git a/compat/regex/regex.h b/compat/regex/regex.h
index de93327..61c9683 100644
--- a/compat/regex/regex.h
+++ b/compat/regex/regex.h
@@ -1,3 +1,6 @@
+#include <stdio.h>
+#include <stddef.h>
+
 /* Definitions for data structures and routines for the regular
    expression library.
    Copyright (C) 1985,1989-93,1995-98,2000,2001,2002,2003,2005,2006,2008
-- 
1.7.2.1.389.gc3d0b