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gnome-settings-daemon: add withSystemd option
Since 7f2a6f17 ("xdg-desktop-portal-gtk: Enable all default portals unconditionally"), building gnome-settings-daemon is necessary to build xdg-desktop-portal-gtk, but it wasn't possible for systems that can't use systemd. I've called the option "withSystemd" as it's the most common name for this kind of option in Nixpkgs. A couple of backports are required for it to build. They can be removed when we update to GNOME 47.