git: update for git 2.0

prefixcmp() and suffixcmp() have been remove, functionality is now
provided by starts_with() and ends_with(). Retrurn values have been
changed, so instead of just renaming we have to fix logic.
Everything else looks just fine.

ui-repolist.c

@@ -99,7 +99,7 @@ static int is_in_url(struct cgit_repo *repo)
 {
 	if (!ctx.qry.url)
 		return 1;
-	if (repo->url && !prefixcmp(repo->url, ctx.qry.url))
+	if (repo->url && starts_with(repo->url, ctx.qry.url))
 		return 1;
 	return 0;
 }