CBLT-164:  set default SYNCGATE_VERSION in build_cblite_android jobs

Change-Id: Ib1234d2f4a431ecbc97009124d968de6c456929b
Reviewed-on: http://review.couchbase.org/32671
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>