Make the build reproducible Whilst working on the Reproducible Builds effort [0], we noticed that unity-java could not be built reproducibly.
This is because it shipped a 'STAMP' file within the .jar that contained the current build date. I'm not convinced by the value of including this file, but a patch is attached that ensures that the content of this file is based on the value of SOURCE_DATE_EPOCH if it is available.
