Respect mathematical operation order piority with the exponent gnu extension

Obtained from:	OpenBSD
Approved by:	des (mentor)
Add two special directives to libmap.conf:
include <file>:
  Parse the contents of file before continuing with the current file.
includedir <dir>:
  Parse the contents of every file in dir that ends in .conf before continuing
  with the current file.
Any file or directory encountered while processing include or includedir
directives will be parsed exactly once, even if it is encountered multiple
times.

Reviewed by:	kib, des
Approved by:	des (mentor)
MFC after:	1 month
Import m4 regression tests from OpenBSD

Obtained from:	OpenBSD
Approved by:	des (mentor)
Unbreak jemalloc build with MALLOC_PRODUCTION set. New jemalloc version
uncovered MIPS-related gcc bug described in
    http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33256

The patch was obtained from r128198 in gcc-4_1-branch, which is GPLv2,
so it's OK to merge it.
GNU/kFreeBSD portability fix. This glue <stdlib.h> overrides header protection
in the system-wide version of <stdlib.h> by wrapping the #include_next
<stdlib.h> within the scope of its own header protection. On FreeBSD this has
no effect, since both header protections are equivalent. However the GNU version
of <stdlib.h> implements a special header protection mechanism which allows it
to be included multiple times (in different modes).

Simply by moving the #include_next off the header protection, we allow
system-wide <stdlib.h> to implement its own protection policy, whichever that
may be.
Add myself to this file - it didn't exist last time.

Approved by:	rmacklem (mentor)
Migrate ARGE_DEBUG to opt_arge.h.

Submitted by:	Stefan Bethke <stb@lassitu.de>
Teach ubldr(8) about simple MBR partitioning.
Bring over the first part of the etherswitch framework - an MDIO bus and
MDIO/MII rendezvous proxy.

* Add an 'mdio' bus, which is the "IO" side of an MII bus (but by design
  can be anything which implements the underlying register access API.)
* Add 'miiproxy' and 'mdioproxy', which provides a rendezvous mechanism
  for MII busses to appear hanging off arbitrary busses (ie, that aren't
  necessarily a traditional looking MII bus.)

MII busses can now hang off anything that implements an mdiobus.

For the AR71xx SoC, there's one MDIO bus but two MII busses.  So to
properly support two or more real PHYs, this can be done:

  # arge0 MDIO bus - there's no arge1 MDIO bus for AR71xx
  hint.argemdio.0.at="nexus0"
  hint.argemdio.0.maddr=0x19000000
  hint.argemdio.0.msize=0x1000
  hint.argemdio.0.order=0

  # Create two mdioproxy instances
  hint.mdioproxy.0.at="mdio0"
  hint.mdioproxy.1.at="mdio0"

  # .. and with a follow-up patch
  hint.arge.0.mdio=mdioproxy0
  hint.arge.1.mdio=mdioproxy0

TODO:

* Do a sweep or two and add appropriate locking in mdio/mdioproxy/miiproxy.

Submitted by:	Stefan Bethke <stb@lassitu.de>
Reviewed by:	ray
Break out the arge MDIO bus code into an optional argemdio device.

This is only done if the ARGE_MDIO option is included.

* Shuffle the arge MDIO bus into a separate device, that needs to be
  probed early (use hint.argemdio.X.order=0)
* hint.arge.X.mdio now specifies which miiproxy to rendezvous with.
* Call MAC/MDIO bus init during MDIO attach, not arge attach.

This is done regardless:

* Shift the arge MAC and MDIO bus reset code into separate functions
  and call it early during MDIO bus attach.  It's required for
  correct MDIO bus IO to occur on AR71xx/AR91xx devices.

* Remove the AR71xx/AR91xx centric assumption that there's only one
  MDIO bus.  The initial code mapped miibus0(arge0) and miibus1(arge1)
  MII register operations to the MII0 (arge0) register space.  The
  AR724x (and later, upcoming chipsets) have two MDIO busses and
  the second is very much in use.

TODO:

* since the multiphy behaviour has changed (where now a phymask of >1
  PHY will still be enumerated), multiphy setups may be quite wrong.
  I'll go and fix these so they still have a chance of working, at least.
  until the switch PHY support appears in -HEAD.

Submitted by:	Stefan Bethke <stb@lassitu.de>
Convert AP96 to use the mdioproxy and ARGE_MDIO option.

arge1 still works (it's the standalone PHY) but arge0 and the other switch
ports don't work.  They're enumerated though, demonstrating that the
mdiobus abstraction is correctly working.
Fix make depend.
- fixed a vnode lock hang-up issue.
- fixed an incorrect lock status issue.
- fixed an incorrect lock issue of unionfs root vnode removed.
  (pointed out by keith)
- fixed an infinity loop issue.
  (pointed out by dumbbell)
- changed to do LK_RELEASE expressly when unlocked.

Submitted by:	ozawa@ongs.co.jp
Improve DDF metadata writing.
Implement volume deletion if disk has more then one partition.
- close the open file after fetching
- create a default /usr/local/etc/pkg.conf

Approved by:	des (mentor)
Change the MIB cycle count API to return HAL_BOOL, rather than uint32_t,
to return whether it was successful.

Add placeholder (blank) methods for previous chips, for both it and
the 11n extension channel busy call.
Added Self-protected action category (including MPM).

* Added new action category IEEE80211_ACTION_CAT_SELF_PROT which is used by 11s
for Mesh Peering Management;
* Updated Self protected enum Action codes to start from 1 instead of 0
according to the standard spec;
* Removed old and wrong action categories IEEE80211_ACTION_CAT_MESHPEERING;
* Modified ieee80211_mesh.c and ieee80211_action.c to use the new action
category code;
* Added earlier verification code in ieee80211_input;

Approved by: adrian
Modified structure and code that handles Mesh peering management.

 * Old struct ieee80211_meshpeer_ie had wrong peer_proto field size;
 * Added IEEE80211_MPM_* size macros;
 * Created an enum for the Mesh Peering Protocol Identifier field according
 to the standard spec and removed old defines;
 * Abbreviated Handshake Protocol is not used by the standard anymore;
 * Modified mesh_verify_meshpeer to use IEEE80211_MPM_* macros for verification;
 * Modified mesh_parse_meshpeering_action to parse complete frame, also to parse
 it according to the standard spec;
 * Modified ieee80211_add_meshpeer to construct correct MPM frames according to
 the standard spec;

Approved by: adrian
Fixed some MPM reason codes and max number of neighbors check

 * Added IEEE80211_MESH_MAX_NEIGHBORS and it is set to 15, same as before;
 * Modified mesh_parse_meshpeering_action to verify MPM frame and send
 correct reason code for when a frame is rejected according to standard spec;
 * Modified mesh_recv_action_meshpeering_* according to the standard spec;
 * Modified mesh_peer_timeout_cb to always send CLOSE frame when in CONFIRMRCV
 state according to the standard spec;

Approved by: adrian