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

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

This commit was generated by cvs2svn to compensate for changes in r160157,
which included commits to RCS files with non-trunk default branches.

Import BETA 10 of HP's Unwind Express. This import does not contain
any modifications to make it build as part of the FreeBSD kernel.
Now that the source appears to have stabilized, local changes will
happen on HEAD and will therefore cause affected files to be pulled
from the vendor branch.