The master branch has been using Gradle for a while. The expectation
at the time was that minor maintenance releases can be done on 2.3.x
with the existing Ant build. However that is no longer possible to
perform a release and we need to perform a 2.3.3 release.
The change mirrors similar changes on the master branch:
4e81930b7250a1cf1def
Issue: SWF-1615