Bug#795868: gerris: please make the build reproducible

[Reiner Herrmann]

Source: gerris
Version: 20131206+dfsg-5
Severity: wishlist
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: locale
X-Debbugs-Cc: reproducible-builds at lists.alioth.debian.org

Hi!

While working on the "reproducible builds" effort [1], we have noticed
that gerris could not be built reproducibly.
A list is sorted with "sort", which behaves differently depending on the locale.

The attached patch fixes this by sorting with LC_ALL set to C.

Regards,
 Reiner

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

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