MB-11336, CBD-1382: populate PRODUCT_VERSION when building
Change-Id: I2740c130ec99ed338eea9cdcf578d827c743f4c3
Reviewed-on: http://review.couchbase.org/38134
Reviewed-by: Chris Hillery <ceej@couchbase.com>
Tested-by: Chris Hillery <ceej@couchbase.com>