[bug#29626] gnurl: Switch to mirror://gnu

[ng0]

Switch source to use the new location at gnu.org.
This includes a tarball format change (tar.bz2 -> tar.xz),
something that wasn't possible on our Drupal Site installation.
Implicit: there's also a hash change.

Thanks to the team at GNU that handled this, although the
procedure took quiet a long time to finish.
-- 
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  WWW: https://n0.is

0001-gnu-gnurl-Use-new-download-URL.patch
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