Update copyright to include the author of the LPC bridge emulation code.
Don't call arc4random_stir() explicitly.  To quote arc4random(3)
manual page:

    There is no need to call arc4random_stir() before using
    arc4random() functions family, since they automatically
    initialize themselves.

No objection:	des
MFC after:	2 weeks
Make userland tools honor WITHOUT_PF build option.

Tested by:	dt71@gmx.com
In r257079, SRCDIR is pointed to ${.CURDIR} when not set.  However,
Makefile.inc1 is being called in sub-make's where make(1) would,
by default, implicitly chdir(2) to ${.OBJDIR} before executing any
targets.  This would make some targets, like delete-old, when trying
to derive various variables introduced by change r256921 using
``make -f Makefile.inc1'' that also rely on SRCDIR to fail.

This changeset adds an explicit cd ${.CURDIR} before these unwrapped
make calls, making them in line with the other ones that are already
being wrapped with the explicit chdir's.

Tested by:	gjb
MFC after:	5 days
Move all interface queue related structures, macros and definitions
from net/if_var to it own new net/ifq.h.

For now net/ifq.h is unconditionally included through net/if_var.h.

This is a mechanical change in preparation to make struct ifnet and
the individual interface queue mechanisms opaque.

Discussed with:	glebius
Sponsored by:	The FreeBSD Foundation