Bug#864082: fontconfig: please make the cache files reproducible

[Johannes Schauer Marin Rodrigues]

Hi,

since this bug has not seen maintainer action for several months now and
because fontconfig is one of the last remaining bits that make a
Priority:Standard chroot unreproducible, I'd like to propose to NMU fontconfig
with the attached patch.

Essentially, I took the patch by Chris Lamb and modified it so that
uuid_generate_sha1() will be used if SOURCE_DATE_EPOCH is set. The original
behaviour is retained without SOURCE_DATE_EPOCH being set. This should be the
solution with zero impact on normal installations while making those
installations that care (like reproducible chroot or image creation)
reproducible.

If I don't get a NACK from you on this, I plan to upload to DELAYED/10 in two
weeks.

Thanks!

cheers, josch
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