This mirrors the behaviour of systemd - It's udev that parses `.link`
files, not `systemd-networkd`.
This was originally applied in 36ef112a477034fc6d1d9170bf1bcda0140a8d1d,
but was reverted due to 1115959a8d4d73ad73341563dc8bbf52230a281e causing
evaluation errors on hydra.