Just run make install on cmake builds

Change-Id: Ie2f0c1c9d61b7cd439d88561f8fe996adce25b7c
Reviewed-on: http://review.couchbase.org/35442
Reviewed-by: Chris Hillery <ceej@couchbase.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>