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libinput: fail if no input found on init

Dominique Martinet requested to merge github/fork/martinetd/libinput_no_device into master

This runs through events pending at init on initialization so we can tell if some devices are available.

Note that with the way wlr_device_lists is managed, this checks that there is at least one device we handle - it doesn't have to be a keyboard, but there is at least a mouse or tablet_pad or something that we care about.

Instead of failing inconditionally it might be better to leave the decision to the user, e.g. add a "backend_has_devices" function to call later.

(Tested by moving /dev/input off)

Fixes #24 (closed).

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