builtin: add a repository parameter for builtin functions

In order to reduce the usage of the global the_repository, add a
parameter to builtin functions that will get passed a repository
variable.

This commit uses UNUSED on most of the builtin functions, as subsequent
commits will modify the actual builtins to pass the repository parameter
down.

Signed-off-by: John Cai <johncai86@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/commit.c b/builtin/commit.c
index b2033c4..768d76a 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -1502,7 +1502,10 @@ static int git_status_config(const char *k, const char *v,
 	return git_diff_ui_config(k, v, ctx, NULL);
 }
 
-int cmd_status(int argc, const char **argv, const char *prefix)
+int cmd_status(int argc,
+const char **argv,
+const char *prefix,
+struct repository *repo UNUSED)
 {
 	static int no_renames = -1;
 	static const char *rename_score_arg = (const char *)-1;
@@ -1641,7 +1644,10 @@ static int git_commit_config(const char *k, const char *v,
 	return git_status_config(k, v, ctx, s);
 }
 
-int cmd_commit(int argc, const char **argv, const char *prefix)
+int cmd_commit(int argc,
+	       const char **argv,
+	       const char *prefix,
+	       struct repository *repo UNUSED)
 {
 	static struct wt_status s;
 	static struct option builtin_commit_options[] = {