FreeBSD_HEAD_i386 - Build #2007 - Fixed

FreeBSD_HEAD_i386 - Build #2007 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/2007/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/2007/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/2007/console

Change summaries:

293022 by adrian:
[net80211] document the (not completely complete) set of places where
we're assuming hz=1000 and not gracefully handling when it isn't.

The math involved will return 0 for hz < 1000, which it is on some
platforms and on DragonflyBSD.

This doesn't fix it, it:

* converts one manual use over to use the macro, and
* comments where it needs some thought/fixing.

I'll think about this a bit more before fixing it.

Submitted by:	imre_at_vdsz.com

293018 by nwhitehorn:
Unify the ELFv1 and ELFv2 code paths and make ELFv1 (the normal ABI) more
correct in the process.

MFC after:	2 weeks

293017 by adrian:
[rtwn] add rtwn module directory.

Pointed out by: dim