config: make git_config_parse_parameter a public function

We use this internally to parse "git -c core.foo=bar", but
the general format of "key=value" is useful for other
places.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

cache.h

@@ -1030,6 +1030,8 @@ extern int config_error_nonbool(const char *);
 extern const char *get_log_output_encoding(void);
 extern const char *get_commit_output_encoding(void);
 
+extern int git_config_parse_parameter(const char *, config_fn_t fn, void *data);
+
 extern const char *config_exclusive_filename;
 
 #define MAX_GITNAME (1000)

config.c

@@ -39,8 +39,8 @@ void git_config_push_parameter(const char *text)
 	strbuf_release(&env);
 }
 
-static int git_config_parse_parameter(const char *text,
-				      config_fn_t fn, void *data)
+int git_config_parse_parameter(const char *text,
+			       config_fn_t fn, void *data)
 {
 	struct strbuf **pair;
 	pair = strbuf_split_str(text, '=', 2);