xwayland: Add xdg-output v3 support

Olivier Fourdan requested to merge ofourdan/xserver:xdg-output-v3 into master

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

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