CBLT-224:  64-bit framwork is in "Release 64bit-ios-universal"

Change-Id: Ie2ffdec46223527e2f7a07d75c9ccc94fff6d823
Reviewed-on: http://review.couchbase.org/33713
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>