Add more bootstrapping bandaids: copy over some of the host system

Add more bootstrapping bandaids: copy over some of the host system
dependent utilities to /bootstrap inside the chroot tree, so the
hosting and targeted environment are not required the same.  By now,
mount/umount (due to the Lite2 changes) and cpio (due to lchown) make
it there.  This should allow building a 3.0-current release from
inside a 2.2 vintage system, and visa verse.

Isn't lchown also a reason for a shared lib version number bump?

PR:
Reviewed by:	jkh