cmake/configure: Provide better proxy Makefile

Change-Id: I827b7fad9812143edd0cfa9e5fb9b62b02df2812
Reviewed-on: http://review.couchbase.org/35383
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>