kern.proc, kern.proc2, kern.lwp, and kern.buf.
Define more MIB for kern.buf so that specific buffers can be selected
(only all/all is supported right now), and use a 32/64 bit agnostic
structure for communcating buffer information to userland.
Convert systat to the new kern.buf method.
Clean up the vm.buf* handling a little. There's no actual need to
record the dynamically assigned OIDs, since sysctl_data can tell us
what we're looking at.
Oh, and fix a typo in a comment.
caea20e952