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plugins: Unset GDK_BACKEND envvar if a specific backend is needed

Michel Dänzer requested to merge daenzer/gnome-settings-daemon:plugins-x11-unset-GDK_DISPLAY into master

This currently affects only the xsettings plugin, which needs GDK to use the x11 backend. It already calls gdk_set_allowed_backends ("x11") for this purpose; however, if GDK_BACKEND=wayland (or any other non-x11 backend possibly) happened to be in the environment, GDK would fail to initialize at all. This would prevent the xsettings plugin from starting up.

Big thanks to Olivier Fourdan for figuring this out!

Bug: https://bugzilla.redhat.com/show_bug.cgi?id=2022283 Bug: https://bugs.debian.org/1008992

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