simplify inclusion of system header files.

This is a mechanical clean-up of the way *.c files include
system header files.

 (1) sources under compat/, platform sha-1 implementations, and
     xdelta code are exempt from the following rules;

 (2) the first #include must be "git-compat-util.h" or one of
     our own header file that includes it first (e.g. config.h,
     builtin.h, pkt-line.h);

 (3) system headers that are included in "git-compat-util.h"
     need not be included in individual C source files.

 (4) "git-compat-util.h" does not have to include subsystem
     specific header files (e.g. expat.h).

Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 0 insertions, 1 deletions

diff --git a/grep.c b/grep.c
index 0fc078ec0a..fcc6762302 100644
--- a/grep.c
+++ b/grep.c
@@ -1,5 +1,4 @@
 #include "cache.h"
-#include <regex.h>
 #include "grep.h"
 
 void append_grep_pattern(struct grep_opt *opt, const char *pat,