It was unused since 405c3050f10, which removed iBCS support.
This also moves the 'linux' rc script earlier, before mountcritlocal,
which fixes mount(8) errors due to missing /dev/shm in setups
with entries for /path/to/chroot/dev/shm without the "late" flag.
Reported By: pstef
I'd add a rust version here, as well as adding it to the other config files for which it's relevant