RFR: 8238650: Allow to override buildDate with SOURCE_DATE_EPOCH

Fri Feb 7 19:37:34 UTC 2020

On Wed, 29 Jan 2020 12:40:05 GMT, Bernhard M. Wiedemann <github.com+637990+bmwiedemann at openjdk.org> wrote:

>> In addition to a signed OCA, we will need a bug filed to track this. Please read the [CONTRIBUTING guidelines](https://github.com/openjdk/jfx/blob/master/CONTRIBUTING.md).
> 
> /signed
> 
> I filed one bug and got review ID : 9063488

> I filed one bug and got review ID : 9063488

OK.

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