RFR: 8238650: Allow to override buildDate with SOURCE_DATE_EPOCH

Wed Aug 26 18:44:24 UTC 2020

On Fri, 8 May 2020 19:03:26 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> 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).

Converted to a Draft PR, so that it will not show up as `rfr`. Go ahead and resubmit it when you are ready to proceed.

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