This treats it similarly to getty@tty1.service and remote-fs.target, which can be
enabled/disabled, but defaults to enabled.
GENERAL_ALIASES += \
$(systemunitdir)/remote-fs.target $(pkgsysconfdir)/system/multi-user.target.wants/remote-fs.target \
+ $(systemunitdir)/systemd-networkd.service $(pkgsysconfdir)/system/multi-user.target.wants/systemd-networkd.service \
$(systemunitdir)/getty@.service $(pkgsysconfdir)/system/getty.target.wants/getty@tty1.service \
$(pkgsysconfdir)/user $(sysconfdir)/xdg/systemd/user \
../system-services/org.freedesktop.systemd1.service $(dbussessionservicedir)/org.freedesktop.systemd1.service