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xrandr: Warn when running with Xwayland

Olivier Fourdan requested to merge ofourdan/xrandr:warn-with-xwayland into master

RandR is only emulated and read-only with Xwayland running rootless.

Check the presence of the XWAYLAND extension on the display and warn when running on Xwayland.

This is heavily inspired by Peter's Hutterer's similar change in xinput.

See-also: xinput!1 (merged)

/cc @whot

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