fetch-pack: Do not fetch tags for shallow clones.

A better fix may be to only fetch tags that point to commits that we
are downloading, but git-clone doesn't have support for following
tags. This will happen automatically on the next git-fetch though.

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/fetch-pack.c b/fetch-pack.c
index bb310b6..80979b8 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -342,7 +342,8 @@
 		if (!memcmp(ref->name, "refs/", 5) &&
 		    check_ref_format(ref->name + 5))
 			; /* trash */
-		else if (fetch_all) {
+		else if (fetch_all &&
+			 (!depth || strncmp(ref->name, "refs/tags/", 10) )) {
 			*newtail = ref;
 			ref->next = NULL;
 			newtail = &ref->next;