The attemp to mount /var/shm causes modprobe to complain that there is no
shm module (on 2.2.x kernels), since shm will be hard compiled into 2.4
afaik, i suggest adding "alias shm off" to /etc/conf.modules, so that new
users won't be scared by this message.

On a related note the mounting of /var/shm at this point also causes an
error that modules.dep doesn't exist on the first boot after a new kernel
install, so maybe do this mount after runnign depmod, before that shm is
probably not needed anyways.