CBD-1384:  turn off auto-layout to allow 10.5 support target

Change-Id: I26b4ee07e0c419006965e775d2f4882a461284d6
Reviewed-on: http://review.couchbase.org/37692
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>