sync with OpenBSD support 486 which lacks pentium_mhz from Jim Rees <rees@umich.edu>
sync with OpenBSD
support 486 which lacks pentium_mhz
from Jim Rees <rees@umich.edu>

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame