Make non-static functions, that may be static, static

Signed-off-by: Stephan Beyer <s-beyer@gmx.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-commit.c

@@ -876,7 +876,7 @@ static void print_summary(const char *prefix, const unsigned char *sha1)
 	}
 }
 
-int git_commit_config(const char *k, const char *v, void *cb)
+static int git_commit_config(const char *k, const char *v, void *cb)
 {
 	if (!strcmp(k, "commit.template"))
 		return git_config_string(&template_file, k, v);

builtin-config.c

@@ -145,7 +145,7 @@ free_strings:
 	return ret;
 }
 
-char *normalize_value(const char *key, const char *value)
+static char *normalize_value(const char *key, const char *value)
 {
 	char *normalized;
 

builtin-for-each-ref.c

@@ -809,7 +809,7 @@ static struct ref_sort *default_sort(void)
 	return sort;
 }
 
-int opt_parse_sort(const struct option *opt, const char *arg, int unset)
+static int opt_parse_sort(const struct option *opt, const char *arg, int unset)
 {
 	struct ref_sort **sort_tail = opt->value;
 	struct ref_sort *s;

builtin-merge.c

@@ -431,7 +431,7 @@ static void merge_name(const char *remote, struct strbuf *msg)
 		sha1_to_hex(remote_head->sha1), remote);
 }
 
-int git_merge_config(const char *k, const char *v, void *cb)
+static int git_merge_config(const char *k, const char *v, void *cb)
 {
 	if (branch && !prefixcmp(k, "branch.") &&
 		!prefixcmp(k + 7, branch) &&