nixpkgs builds displaylink with requireFile, so every driver version bump
(6.2.0-30 -> 6.3.0-48) stopped the system build until the zip was put into
the store by hand. pkgs/displaylink.nix overlays requireFile with fetchurl,
taking name and hash from nixpkgs and the URL from its requireFile message.
Applied in nixosModules.moonarch, since the NixOS module reads
pkgs.displaylink directly.
