MB-8260: Add cbsasl library to the build

Change-Id: Id022c5fff9525dfcf5b86102dc5e72ca52e435f6
Reviewed-on: http://review.couchbase.org/28094
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>