ls-remote: define die() now we do not use git-sh-setup

Another interesting "property" is that from inside a git managed
tree, "git-ls-remote ." names the current repository no matter
how deep a subdirectory you are in.

Signed-off-by: Junio C Hamano <junkio@cox.net>

git-ls-remote.sh

@@ -6,6 +6,11 @@ usage () {
     exit 1;
 }
 
+die () {
+    echo >&2 "$*"
+    exit 1
+}
+
 while case "$#" in 0) break;; esac
 do
   case "$1" in