xwayland: Make Wayland logs non-fatal

Merged Olivier Fourdan requested to merge ofourdan/xserver:xwayland-wayland-logs into master

The Wayland library may log warnings, we do not need to make that fatal to the Xserver.

By killing the Xserver whenever a warning is raised, we hide other log messages that might be also interesting.

Signed-off-by: Olivier Fourdan ofourdan@redhat.com

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