- Copy stable/10@285827 to releng/10.2 in preparation for 10.2-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.2.
- Update default pkg(8) configuration to use the quarterly branch.[1]

Discussed with: re, portmgr [1]
Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r281502:

Sync with OpenBSD: Use volatile instead of __volatile__.

MFC r267372-267374: fix various misimplementation of instructions.

Submitted by: Wolf Ramovsky <wolf.ramovsky gmail.com>

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Integrate OpenBSD rev 1.5 of x86emu.c.

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

Import x86emu from OpenBSD as of OPENBSD_4_6.

Import x86emu from OpenBSD (src/sys/dev/x86emu).

x86emu is a software emulator for the real mode x86 processor, originally
written by SciTech Software, Inc. for XFree86 and has been later ported
to NetBSD then OpenBSD.