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/path.h b/path.h
index ed6732e5a..b654ea8ff 100644
--- a/path.h
+++ b/path.h
@@ -2,6 +2,7 @@
 #define PATH_H
 
 struct repository;
+struct strbuf;
 
 /*
  * The result to all functions which return statically allocated memory may be