nixos/systemd: don't try to install systemd-initctl.{service,socket}
nixos/systemd: don't try to install systemd-initctl.{service,socket}

Since systemd 246, these are only installed by systemd if
HAVE_SYSV_COMPAT is true, which only is the case if you set
sysvinit-path and sysvrcnd-path (which we explicitly unset in the
systemd derivation for quite some time)

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