Fix clone not to ignore depth when performing a local clone

When git-clone detects that it can perform a local clone it
follows a path that silently ignores the depth parameter.

Presumably if the user explicitly requests a shallow clone they
have a reason to prefer a space efficient clone of just the recent
history so bypass the local magic if the user specifies the depth
parameter.

Signed-off-by: Charles Bailey <charles@hashpling.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: hashpling

git-clone.sh

@@ -205,7 +205,10 @@ fi
 # it is local
 if base=$(get_repo_base "$repo"); then
 	repo="$base"
-	local=yes
+	if test -z "$depth"
+	then
+		local=yes
+	fi
 fi
 
 dir="$2"