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

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

Integrate the Camellia Block Cipher. For more information see RFC 4132
and its bibliography.

Submitted by: Tomoyuki Okazaki <okazaki at kick dot gr dot jp>
MFC after: 1 month