compositor: remove input_loop

Remove the input event loop.

After "compositor-x11: stop using input_loop", the input event loop is
completely unused.

The code was also broken because it did not account for multiple outputs
with independent repaint cycles.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Derek Foreman <derekf@osg.samsung.com>
2 files changed