Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

Merge the projects/release-pkg branch to head.

This allows packaging the base system with pkg(8), including
but not limited to providing the ability to provide upstream
binary update possibilities for non-tier-1 architectures.

This merge is a requirement of the 11.0-RELEASE, and as such,
thank you to everyone that has tested the project branch.

Documentation in build(7) etc. is still somewhat sparse, but
updates to those parts will follow.

Sponsored by: The FreeBSD Foundation

Remove NO_WERROR, after fix from r292023.

Merge from OpenBSD:
revision 1.13
date: 2015/12/09 11:54:12; author: tb; state: Exp; lines: +2 -2
Add a cast to silence a compiler warning by clang on FreeBSD.
From Craig Rodrigues.
ok tedu@

Merge from OpenBSD:
revision 1.12
date: 2015/12/05 13:06:52; author: claudio; state: Exp; lines: +4 -6
Do not loop on EAGAIN in imsg_read(). Better to return the error to the
caller and let him do another poll loop. This fixes spinning relayd
processes seen on busy TLS relays. OK benno@ henning@

Merge from OpenBSD:
revision 1.11
date: 2015/11/27 01:57:59; author: mmcc; state: Exp; lines: +2 -3
Remove three NULL-checks before free(). ok millert@

Fix bootstrapping of libopenbsd on build hosts where KERN_PROC_NFDS
it not defined.

Add imsg to libopenbsd.

This will help with importing OpenBSD programs such as ypldap
into the base system.

Implemtn getdtablecount() to count open file descriptors for current process.

Use underlying sysctl implemented by mjg in r290473.

PR: 194985
Reviewed by: bapt, mjg
Differential Revision: https://reviews.freebsd.org/D4084

Fix spelling error.

Reported by: junovitch

Add README, similar to the one from libnetbsd.

Import imsg from OpenBSD's libutil.

imsg provides functions for communication between processes
using sockets. imsg is used by programs in OpenBSD such as ypldap.

Rename libohash to libopenbsd.

libopenbsd is an internal library which
to bring in compatibility stuff from OpenBSD.
This will allow us to bring in more
OpenBSD utilities into the FreeBSD base system.

We similarly use libnetbsd for bringing in stuff from NetBSD.

Reviewed by: bapt
Differential Revision: https://reviews.freebsd.org/D4078

Include stddef.h for ptrdiff_t

Add META_MODE support.

Off by default, build behaves normally.
WITH_META_MODE we get auto objdir creation, the ability to
start build from anywhere in the tree.

Still need to add real targets under targets/ to build packages.

Differential Revision: D2796
Reviewed by: brooks imp

Make libohash a proper internallib instead of hidding it in m4

mandoc development seems to be also using ohash so prepare to share the code when
needed

mdoc: fix date.

Fix build with gcc

Remove ohash_int.h forgotten in previous commit

Sync with OpenBSD
This brings:
- check for integer overflows in custom allocs
- fix potential integer overflows in memory allocation
- annotate regexp error messages with source string
- better error handling in mkstemp/unlink/fdopen logic

mdoc: convert .Fd to .In, which is much nicer.

Remove contractions.

Globally replace u_int*_t from (non-contributed) man pages.

The reasoning behind this, is that if we are consistent in our
documentation about the uint*_t stuff, people will be less tempted to
write new code that uses the non-standard types.

I am not going to bump the man page dates, as these changes can be
considered style nits. The meaning of the man pages is unaffected.

MFC after: 1 month

Synchronize with laster version of m4 from OpenBSD and NetBSD
This bring better compatibility with gnum4

Reviewed by: cognet
Approved by: cognet
Obtained from: OpenBSD, NetBSD