Bug#807829: 4ti2: please make the build reproducible

[Reiner Herrmann]

Source: 4ti2
Version: 1.6.7+ds-1
Severity: wishlist
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: timestamps locale
X-Debbugs-Cc: reproducible-builds at lists.alioth.debian.org

Hi!

While working on the "reproducible builds" effort [1], we have noticed
that 4ti2 could not be built reproducibly.
It embeds a locale- and timezone-dependent timestamp into the
documentation.

The attached patch fixes this by using the C locale and UTC for
generating the timestamp.

Regards,
 Reiner

[1]: https://wiki.debian.org/ReproducibleBuilds
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