[RFC] Partial MFC of SYSCTL changes in -current

[Hans Petter Selasky]

Hi,

Partial MFC of r267961, r267973, r267985, r267992, r267993, r268005:
Backport some macro definitions so to make backporting code from
FreeBSD head easier.

MFC after:	1 week

Any objections?

--HPS
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