[PATCH] gnu: magit: Update to 2.2.1.

[Alex Kost]

Magit 2.2.0 is not actual anymore, so here is the updated patch.  I have
a question however: I've noticed that there are 2 tarballs available:

- <https://github.com/magit/magit/releases/download/2.2.1/magit-2.2.1.tar.gz>

  This one does not include tests, but it has "magit-version.el" file so
  there is no need to specify "VERSION" flag (see
  <http://lists.gnu.org/archive/html/guix-devel/2015-08/msg00487.html>).

- <https://github.com/magit/magit/archive/2.2.1.tar.gz>

  This is a "raw" snapshot of the repo, so there are tests, but
  "VERSION" flag should be specified.

So what tarball should we use?  I think it's better to take the second
one (with tests).

0001-gnu-magit-Update-to-2.2.1.patch
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