git-repack: allow git-repack to run in subdirectory
git-repack: allow git-repack to run in subdirectory

Now that we explicitly create all tmpfiles below $GIT_DIR, there's no reason
to care about which directory we're in.

Signed-off-by: Jeff King <696e3fbcf235d40b6ea1ebd61c87cbea79d444e7@peff.net>
Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git