don't pull standalone mccouch which is long dead

Change-Id: I08942804667c93d3279897ce9d5ff9460b93b9eb
Reviewed-on: http://review.couchbase.org/23744
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>