Keep some git-* programs in $(bindir)

Otherwise remote executions directly over ssh won't find them as they used to. --upload-pack and --receive-pack options _could_ be used on the client side, but things should keep working out-of-box for older clients. Later versions of clients (fetch-pack and send-pack) probably could start asking for these programs with dashless form, but that is a different topic. Signed-off-by: Junio C Hamano <gitster@pobox.com>