Allow to override build date with SOURCE_DATE_EPOCH
- Oct 28, 2020
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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. Also use UTC to be independent of timezone. This date call is designed to work with all variants of date. Without this patch, builds of https://build.opensuse.org/package/show/science/lal always varied even when nothing changed. This PR was done while working on reproducible builds for openSUSE.
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