i committed my machine independent kernel build machinery a little
while ago.  the motivation for this is to get rid of the drift and
cruft that accumulates between the various kernel makefiles.  there
are obvious wins to this (kernel build features are easily added to
all ports instead of just one at a time, and old pieces can be ripped
out easily) besides the basic feature that all the kernel makefiles
get a lot smaller (and, hopefully, easier to maintain and understand).

i've tried to provide places that all the ports can plug into so that
they will require little to no customization.  i'll try to put
together a template makefile that other ports can follow that
documents all the available options for a particular platform (which i
think i've already documented in the mi include file).

so far, i've transitioned i386, sparc, alpha, and vax.  hopefully,
others will be quick to follow, although at this point, any port not
transitioned won't be missing out on much.  for now.  :-)

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