RFR: 8264449: Enable reproducible builds with SOURCE_DATE_EPOCH [v2]

[John Neffenger]

On Fri, 2 Apr 2021 17:45:38 GMT, John Neffenger <jgneff at openjdk.org> wrote:

>> Media makefiles look fine.
>
>> Silly question, is the difference with Windows just the nature of the native support on each platform (Unix based vs Windows) and libraries used as part of that?
> 
> That's a good question. I'm hoping the answer is no. So far, the difference with Windows is the linker. The other systems use the GNU linker where it's enough to sort the input object files. The Microsoft linker, though, creates reproducible builds with the flag `/experimental:deterministic` (or `-experimental:deterministic`). So on Windows, we just need to figure out where to put the flag. I'm finding that to be a challenge for the WebKit library.

> /contributor add ...

@bmwiedemann I added you as co-author of pull request #422, which is my continuation of your pull request #99 from last year. This pull request #446 temporarily includes our co-authored commit, but those changes will disappear when #422 is integrated and I merge the master branch into this one. Sorry for the confusion.

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PR: https://git.openjdk.java.net/jfx/pull/446