RFR: 8238650: Allow to override buildDate with SOURCE_DATE_EPOCH

Fri May 8 19:05:35 UTC 2020

On Wed, 15 Apr 2020 02:35:44 GMT, Bernhard M. Wiedemann <github.com+637990+bmwiedemann at openjdk.org> wrote:

>> @bmwiedemann are you planning to pursue this PR?
>
> Long term, yes.
> 
> I am currently low on time and my Java-foo is not that great, so I was hoping that someone would pick it up.

I note that the JDK build recently implemented this feature in JDK 15 with
[JDK-8244592](https://bugs.openjdk.java.net/browse/JDK-8244592).

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PR: https://git.openjdk.java.net/jfx/pull/99