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

Upgrade to OpenSSH 7.2p2.

Replace unneeded manual dependency on header by adding it to SRCS.

bsd.lib.mk and bsd.prog.mk already depend all objs on headers in SRCS if
there is not yet a depend file. The headers in SRCS are never built or
installed. After 'make depend' the header was already added as a proper
dependency on the objects where needed.

MFC after: 2 weeks
Sponsored by: EMC / Isilon Storage Division

Remove remnant from USEPRIVATELIB removal

Sponsored by: gandi.net

Reduce overlinking
The framework now ensure by itself that pthread is added to the link chain
as the last component if linked to kerberos hence avoid with out any explicit
addition prevent issue like CVE-2014-8475

Convert to LIBADD
Reduce overlinking

Rework privatelib/internallib

Make sure everything linking to a privatelib and/or an internallib does it directly
from the OBJDIR rather than DESTDIR.
Add src.libnames.mk so bsd.libnames.mk is not polluted by libraries not existsing
in final installation
Introduce the LD* variable which is what ld(1) is expecting (via LDADD) to link to
internal/privatelib
Directly link to the .so in case of private library to avoid having to complexify
LDFLAGS.

Phabric: https://phabric.freebsd.org/D553
Reviewed by: imp, emaste

Use src.opts.mk in preference to bsd.own.mk except where we need stuff
from the latter.

Clean up the OpenSSH build. It is now possible to build most components
as static binaries, if desired. The one exception is sshd, which runs
into trouble due to libpam.a's includion of pam_ssh.

Make OpenSSH use LDNS if available. This allows it to verify signed
SSHFP records.

Approved by: re (blanket)

Make libldns and libssh private.

Approved by: re (blanket)

Forgot to svn add the Makefile.