Fixes https://github.com/NixOS/nixpkgs/pull/461277#issuecomment-3556593423
Musl does not have utmp. Systemd implicitly disables utmp support,
but we need to document this disable in nix or else `nixos/modules/system/boot/systemd.nix`
will attempt to load a non-existant service resulting in errors.
Grimmauld
ade259a29d