Check PRIV_VFS_MOUNT when jailed.

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Hi.

I'd like to commit this patch:

	http://people.freebsd.org/~pjd/patches/vfs_mount.c.9.patch

It currently should change nothing, but will be needed once we allow to
grant privileges for jails. I'd like to commit it now, so I can
experiment easier with my ZFS improvements.

--=20
Pawel Jakub Dawidek                       http://www.wheel.pl
[e-mail]                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!

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