Add "git-clone-script" thingy

It's just a trivial wrapper, but it should make Jeff's kernel developer
guide to git look a bit less intimidating.

Makefile

@@ -24,7 +24,8 @@ SCRIPTS=git git-apply-patch-script git-merge-one-file-script git-prune-script \
 	git-pull-script git-tag-script git-resolve-script git-whatchanged \
 	git-deltafy-script git-fetch-script git-status-script git-commit-script \
 	git-log-script git-shortlog git-cvsimport-script git-diff-script \
-	git-reset-script git-add-script git-checkout-script gitk
+	git-reset-script git-add-script git-checkout-script git-clone-script \
+	gitk
 
 PROG=   git-update-cache git-diff-files git-init-db git-write-tree \
 	git-read-tree git-commit-tree git-cat-file git-fsck-cache \

git-clone-script

@@ -0,0 +1,7 @@
+#!/bin/sh
+repo="$1"
+dir="$2"
+mkdir $dir || exit 1
+cd $dir
+git-init-db
+git fetch "$repo" && ( git-rev-parse FETCH_HEAD > .git/HEAD )