MFC r196172:

MFC r196172:
  Start respecting WITHOUT_INET6.

  Make regression/priv compile again after the multi-IP jail
  changes.  Note that we are still using the legacy jail(2)
  rather than the jail_set(2)/jail(3) syscall.
  Add an IPv4,  and an IPv6 loopback address in case we compile
  with INET6 enabled.

  Make the priv_vfs_extattr_system compile on amd64 as well using the
  proper length modifier to printf(3) for ssize_t.

  Reviewed by:  rwatson

Approved by:	re (kib)

git-svn-id: svn://svn.freebsd.org/base/stable/8@196173 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f