Fix build without wayland
Our CI system brought this build error to the surface when building with -Dwayland=false
:
../gnome-settings-daemon-3.28.0/plugins/common/gsd-device-manager-udev.c:27:10: fatal error: gdk/gdkwayland.h: No such file or directory
#include <gdk/gdkwayland.h>
^~~~~~~~~~~~~~~~~~
(full build log: https://gitlab.exherbo.org/marv/gnome/-/jobs/2754)
Edited by Marvin Schmidt