x86emu: remove localy added __FBSDID

This partially reverts 0a2e9846fdf3f3d42a9ee65d0d8669f6be11c879.

Reviewed by: imp, delphij
Differential Revision: https://reviews.freebsd.org/D42705

Optimize ROL and ROR emulations and fix comments.

Silence VPS-Studio errors (V646). These is no functional change.

Sync with OpenBSD: Use volatile instead of __volatile__.

MFC after: 2 weeks

Fix decoding of near CALL when address-size prefix (67h) is present.

Submitted by: Wolf Ramovsky <wolf.ramovsky gmail.com>
via core (peter)
MFC after: 2 weeks

Fix decoding of LEA when address-size prefix (67h) is present.

This is loosly based on Xorg changeset f57bc0e by Christian
Zander.

Submitted by: Wolf Ramovsky <wolf.ramovsky gmail.com>
via core (peter)
MFC after: 2 weeks

Fix decoding of MOVSX.

Submitted by: Wolf Ramovsky <wolf.ramovsky gmail.com>
via core (peter)
MFC after: 2 weeks

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

MFC x86emu/x86bios emulator and make previously i386 only dpms and vesa
framebuffer driver, etc. work on FreeBSD/amd64.

A significant amount of improvements were done by jkim@ during the recent
months to make vesa(4) work better, over the initial code import. This
work is based on OpenBSD's x86emu implementation and contributed by
paradox <ddkprog yahoo com> and swell.k at gmail com.

Hopefully I have stolen all their work to 8-STABLE :)

All bugs in this commit are mine, as usual.

Use __FBSDID to embed RCS ID.

Collapase interrupt supporting functions to a new module, and switch from
x86emu to this new module.

This changeset also brings a fix for bugs introduced with the initial
x86emu commit, which prevents the user from using some display mode or
cause instant reboots during mode switch.

Submitted by: paradox <ddkprog yahoo com>

- Port x86emu to FreeBSD.
- Connect x86emu to build.

Tested with: make universe
Submitted by: swell.k at gmail com