Add a buildkernel and an installkernel target. With these targets users can more easily upgrade.
Add a buildkernel and an installkernel target. With these targets
users can more easily upgrade.

buildworld now makes usr.sbin/config in bootstrap-tools so that
when you first make buildworld, buildkernel will use config(8)
from the temp. world tree (and of course also the compiler).

Which kernel to built is determined by the KERNEL variable. You
can have as many kernels listed as you like. When a config file
exists for the given MACHINE it will be built. When KERNEL has
not been defined it will be set to "GENERIC GENERIC98".

The first valid kernel named in the list will be used by the
installkernel target.

When NOCLEAN is defined the kernel object directory is *not*
removed by config first. This is in line with normal buildworld
behaviour.

The buildkernel target makes aicasm in sys/dev/aic7xxx first and
unconditionally. This hack allows us to cross-build kernels and
can go away when the problem is solved in a structural way.

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