upload-pack: send non-HEAD symbolic refs

With the same mechanism as used to tell where "HEAD" points at to
the other end, we can tell the target of other symbolic refs as
well.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

upload-pack.c

@@ -798,6 +798,7 @@ static void upload_pack(void)
 	struct string_list symref = STRING_LIST_INIT_DUP;
 
 	head_ref_namespaced(find_symref, &symref);
+	for_each_namespaced_ref(find_symref, &symref);
 
 	if (advertise_refs || !stateless_rpc) {
 		reset_timeout();