Use RELEASE_NOTES date instead of build date #1289
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Use
RELEASE_NOTES
date instead of build dateto 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.
This date call only works with GNU date and BSD date.
Alternatively, https://reproducible-builds.org/docs/source-date-epoch/#makefile could be implemented.
This patch was done while working on reproducible builds for openSUSE, sponsored by the NLnet NGI0 fund.