MAKEDEV contains elements that are not shareable across machine
arch (CPUs), thus is not a candidate for /sbin/.

While moving MAKEDEV out of /dev/ is ideal, it will have to wait
until major/minor devices are unitified, or until devfs is integrated.

Note that currently an under-populated /dev (missing /dev/console)
will trigger the system to mount a MFS and populated with the
/dev/MAKEDEV.  This should take care of the specific case in the PR.