Bug#962021: graphviz: Embeds different date based on timezone

[Vagrant Cascadian]

Package: graphviz
Version: 2.42.2-4
Severity: normal
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: timestamps
X-Debbugs-Cc: reproducible-bugs at lists.alioth.debian.org

When built on machines with different timezones, many of the .pdf files
in the graphviz packages embed a different date.

There is already support in the code for using SOURCE_DATE_EPOCH, which
is great!  It also needs pass the "-gmt True" argument when rendering
the time in order to ensure the system timezone doesn't change the
result.

Patch attached which does this.

Thanks!


live well,
  vagrant
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