Bernhard M. Wiedemann 297fe90329 Allow to override build date with SOURCE_DATE_EPOCH
[ChangeLog][qmake] Allows to override _DATE_ with SOURCE_DATE_EPOCH
to make builds reproducible.

See https://reproducible-builds.org/ for why this is good
and https://reproducible-builds.org/specs/source-date-epoch/
for the definition of this variable.

Fixes: QTBUG-115737
Change-Id: I1964aa0a3d849628440618aa6f0a51af2017d824
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
2023-08-09 10:02:06 +02:00
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