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colord: add enableSystemd option
Since 7f2a6f17 ("xdg-desktop-portal-gtk: Enable all default portals unconditionally"), building colord 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 "enableSystemd" for consistency with the existing "enableDaemon" option. As usual in Nixpkgs, the user is responsible for also overriding udev to a non-systemd implementation if necessary.