xwayland: Add xdg-output v3 support

xdg-output v3 marks xdg-output.done as deprecated and compositors are
not required to send that event anymore.

So if the xdg-output version is 3 or higher, simply set the initial
value `xdg_output_done` to TRUE so we don;'t wait/expect that event
from the compositor.

Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
3 jobs for xdg-output-v3 in 5 minutes and 35 seconds (queued for 1 second)
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