ext2fs: add two new reserved inodes.

According to online documentation [1], Ext4 has two new "special"
inodes so add the new exclude and replica inodes.

Reference:
[1] https://ext4.wiki.kernel.org/index.php/Ext4_Disk_Layout

Reported by:	Mike Ma
MFC after:	3 weeks
Turn 'n' into a local variable.  This is required for additional changes.

Submitted by:	Sebastian Huber <sebastian.huber@embedded-brains.de>
Add const qualifier where appropriate

Submitted by:	Sebastian Huber <sebastian.huber@embedded-brains.de>
Add const qualifier where appropriate

Submitted by:	Sebastian Huber <sebastian.huber@embedded-brains.de>
Avoid using a static buffer in atalk_ntoa.  This will help allow users to call route(1) as a library.

Submitted by:	Sebastian Huber <sebastian.huber@embedded-brains.de> (older version)
Discussed on:	-hackers
Reviwed by:	adri (different older version)
Add "null" backend to mdconfig(8).  This does exactly what the name
suggests, and is somewhat useful for benchmarking.

MFC after:	1 month
No objections from:	kib
Sponsored by:	The FreeBSD Foundation
Update release notes.

Submitted by: skreuzer
Change comment to match code.

Discussed with:	thompsa
Sponsored by:	The FreeBSD Foundation
Fix external compiler warning(s). Avoid pointer dereferencing.
Fix what looks like a typo after r258732.
Add missing period for WITHOUT_PKGBOOTSTRAP so that it matches all
other entries.

Approved by:	bapt
MFC after:	3 days
Regenerate after r258924

MFC after:	3 days
Approved by:	bapt (implicit)
Regenerate after r258838
Fix a regression introduced by SVN r257842 that prevents Encryption from
being enabled.

MFC after:	3 days
Rename sysctl kern.supported_abis to kern.supported_archs, since it gives
the set of MACHINE_ARCH values that can be run.
drm: Read PCIER_LINK_CAP/PCIER_LINK_CAP2 from the PCI bridge

Before this fix, capabilities were read from vgapci and were incorrect.
Add missing bits from the vendor's 2005-05-04 change to
contrib/byacc/makefile.in ("add YYPATCH here so it can be tested by
applications") so that applications have a hope of detecting newer
FreeBSD YACC output from an older one.

Submitted by: Juniper Networks
route(1): Pull static buffer out of the function and into function scope.

This will make it easier to link as a library.

Submitted by:	Sebastian Huber <sebastian.huber@embedded-brains.de> (older version)
Discussed on:	-hackers
route(1): Pull static variable out of the function and into function scope.

This will make it easier to link as a library.

Submitted by:	Sebastian Huber <sebastian.huber@embedded-brains.de> (older version)
Discussed on:	-hackers
route(1): Pull static buffer out of the function and into function scope.

This will make it easier to link as a library.

Submitted by:	Sebastian Huber <sebastian.huber@embedded-brains.de> (older version)
Discussed on:	-hackers