Add fwdv(4) driver for DV video capture from FireWire camcorders
using AV/C protocol and isochronous streaming.

Supports AV/C tape transport commands (play, stop, ff, rewind, pause,
record, eject) with NTSC/PAL auto-detection and read(2) interface
for frame capture.

Reviewed by:	adrian
Differential Revision:	https://reviews.freebsd.org/D58122

Expose audio capture from Apple FireWire devices as a standard
pcm(4)/dsp(4) device via the newpcm framework.

(adrian: I've tested this on an isight camera and looped
it back to USB speakers via "sox -t oss /dev/dsp3 -t oss /dev/dsp4")

Reviewed by:	adrian
Differential Revision:	https://reviews.freebsd.org/D58109

Add fwcam(4), a driver for IIDC v1.30 (TA Document 1999023) digital
cameras over IEEE 1394.

Supports Format_0 (VGA) video modes with isochronous receive DMA,
feature control (brightness, exposure, gain, shutter, white balance,
focus, etc.), poll/kqueue, and hot-plug via bus reset handling.

Reviewed by:	adrian
Differential Revision:	https://reviews.freebsd.org/D57685

This is a residual of the $FreeBSD$ removal.

MFC After: 3 days (though I'll just run the command on the branches)
Sponsored by: Netflix

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

and remove non-present symbols that are now reported by kmod_syms.awk.

Reviewed by:	emaste
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D32878

This simplifies make output/logic

Tested with:	`cd sys/modules; make ALL_MODULES=` on amd64
MFC after:	1 month
Sponsored by:	Dell EMC Isilon

opt_inet6.h into kmod.mk by forcing almost everybody to eat the same
dogfood. While at it, consolidate the opt_bpf.h and opt_mroute.h
targets here too.

require it.

Submitted by:	pjd