Add missing includes and forward declarations

I looped over the toplevel header files, creating a temporary two-line C
program for each consisting of
  #include "git-compat-util.h"
  #include $HEADER
This patch is the result of manually fixing errors in compiling those
tiny programs.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/reflog-walk.h b/reflog-walk.h
index 7553c44..cb3e737 100644
--- a/reflog-walk.h
+++ b/reflog-walk.h
@@ -3,6 +3,7 @@
 
 #include "cache.h"
 
+struct commit;
 struct reflog_walk_info;
 
 extern void init_reflog_walk(struct reflog_walk_info **info);