* gnu/packages/gnome.scm (mutter): Update to 3.22.2. Add comment
noting that forked versions of 'cogl' and 'clutter' are now bundled
with mutter.
[arguments]: Add "--disable-wayland" to configure flags. Add TODO comments
reminding us to add support for wayland and the native backend. Add configure
flags from 'cogl' and 'clutter'.
[propagated-inputs]: Remove clutter. Add new inputs needed by
mutter-{clutter,cogl}-1.0.pc.
[inputs]: Add libgudev and libxrandr. Move libxkbcommon to propagated-inputs.
Remove mesa-headers, replaced by mesa in propagated-inputs.
(cogl, clutter): Add comments to note that changes to cogl and clutter may
also be needed in mutter.
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