RFR: 8264449: Enable reproducible builds with SOURCE_DATE_EPOCH

[Bernhard M.Wiedemann]

On Thu, 1 Apr 2021 17:50:47 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> It would be better to add the flag in `libxml/CMakeLists.txt` or in `build.gradle` via `cmakeArgs`.
>
> Ideally the latter, if feasible, so that the logic to handle `SOURCE_DATE_EPOCH` is more localized.

IMHO, it would make sense to merge any clear improvement of the status-quo and debug+fix more in a later PR. "Perfect is the enemy of good."

Regarding Webkit, I know of
https://bugs.webkit.org/show_bug.cgi?id=174540
https://bugs.webkit.org/show_bug.cgi?id=188738
https://build.opensuse.org/request/show/667729
but your version is probably not *that* old.

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