RFR: 8238650: Allow to override buildDate with SOURCE_DATE_EPOCH

[John Neffenger]

On Thu, 25 Mar 2021 02:35:24 GMT, John Neffenger <jgneff at openjdk.org> wrote:

>>> @jgneff Could not parse `bmwiedemann` as a valid contributor.
>> 
>> You might retry the "contributor" command with the `@` before their GitHub username (I'm not 100% sure that will work, though).
>
>> You might retry the "contributor" command with the `@` before their GitHub username.
> 
> Thanks. I'll try that now. I checked and Bernhard is on the list of "OCAs submitted prior to 2021," but not on the OpenJDK Census list, in case that matters.
> 
> By the way, should I be adding my own name, too? It looks as if sometimes people do that and sometimes not. That would put me as "Author" and also on a line with "Co-authored-by" in the commit message.

> This is a simple enough change by itself, but since it is intended as the start of a larger effort, I'd like @johanvos (or someone else he designates from Gluon) to be a second reviewer.

I jumped the gun and created the [follow-up pull request][1]. I thought it might help when reviewing this pull request to have a full picture of that larger effort. Although these two changes are part of a huge undertaking in the open-source community, it turns out that the changes required on our part are quite small.

[1]: https://github.com/openjdk/jfx/pull/446

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PR: https://git.openjdk.java.net/jfx/pull/422