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Use cmake TIMESTAMP function

Bernhard M. Wiedemann requested to merge wiedemann/digikam:date into master

This greatly simplifies code and allows to override build date with SOURCE_DATE_EPOCH in order 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.

We still use UTC to be independent of timezone.

Without this patch, /usr/lib64/libdigikamcore.so.7.2.0 always varied between clean builds.

Related to commit 6cc8e8b0 CCBUGS: 237010

This PR was done while working on reproducible builds for openSUSE.

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