Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

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

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

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.