Merge branch 'ak/fewer-includes'

* ak/fewer-includes:
  cat-file: remove unused includes
  git.c: remove unnecessary #includes

builtin/cat-file.c

@@ -4,12 +4,8 @@
  * Copyright (C) Linus Torvalds, 2005
  */
 #include "cache.h"
-#include "exec_cmd.h"
-#include "tag.h"
-#include "tree.h"
 #include "builtin.h"
 #include "parse-options.h"
-#include "diff.h"
 #include "userdiff.h"
 #include "streaming.h"
 

git.c

 #include "builtin.h"
-#include "cache.h"
 #include "exec_cmd.h"
 #include "help.h"
-#include "quote.h"
 #include "run-command.h"
-#include "commit.h"
 
 const char git_usage_string[] =
 	"git [--version] [--help] [-C <path>] [-c name=value]\n"