Pass --quiet to cpio in git-clone to hide the (confusing) "0 blocks" message.
For compatibility with operating systems which might not support GNUisms,
the presence of --quiet is probed for by grepping cpio's --help output.
Signed-off-by: Bryan Donlan <bdonlan@fushizen.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>