Bug#968627: libjpeg-turbo: Use UTC timestamp for build date

[Vagrant Cascadian]

Source: libjpeg-turbo
Severity: normal
Version: 1:2.0.5-1.1
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: timezone
X-Debbugs-Cc: reproducible-bugs at lists.alioth.debian.org

The build date is embedded in various files such as libjpeg.so.62.3.0:

  libjpeg-turbo·version·2.0.5·(build·20200731)	vs. libjpeg-turbo·version·2.0.5·(build·20200801)


While CMake respects SOURCE_DATE_EPOCH, it still can produce a different
date depending on the timezone of the running system.

Applying the attached patch explicitly sets the timezone to UTC and
should result in a reproducible build for bullseye:

  https://tests.reproducible-builds.org/debian/libjpeg-turbo

There may be other reproducibility issues caused by changing build path
for sid tests that are not addressed by this patch.

Thanks for maintaining libjpeg-turbo!

live well,
  vagrant

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