update toy build file

Change-Id: If98c9b41a97f8f7893fb81ae5cf025b4d23f5f0c
Reviewed-on: http://review.couchbase.org/24622
Reviewed-by: Junyi Xie <junyi.couchbase@gmail.com>
Tested-by: Junyi Xie <junyi.couchbase@gmail.com>