[Reproducible-builds] Reproducible foomatic db

[Reiner Herrmann]

Hi!

While working on Debian's “reproducible builds” effort [1], we have
noticed that gutenprint doesn't build reproducibly [2].
The order of printers (and other attributes) in foomatic xml files
is not deterministic and varies on every build.

The attached patch fixes this by sorting Perl hashes that are iterated,
to produce the same output every time.

Regards,
 Reiner

[1]: https://wiki.debian.org/ReproducibleBuilds
[2]: https://reproducible.debian.net/gutenprint
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