Hi Guix!

Here are patches to fix clementine with the recent move to Qt 5.11.

All three packages were using a deprecated CMake directive.  In the case
of clementine, it is fixed on the qt5 branch so I thought we'd just
update our snapshot. libmygpo-qt was also fixed upstream so we can pick
up the two patches that fixes the issue [0].

Now libechonest was more problematic as it looks unmaintained.  And,
after a bit of digging, it turns out it has been removed from clementine
since June 2016! [1].  The web service it interfaces with isn't
available anymore.  So let's just remove this package as it's obsolete.
I should have dropped it as a dependency ages ago, the released qt4
version of clementine required it but I didn't notice it was obsolete
then, sorry about that!

Thanks,
Pierre

[0]: https://github.com/gpodder/libmygpo-qt/pull/15
[1]: https://github.com/clementine-player/Clementine/issues/5384