NEX-9559 remove nza-closed cruft
Reviewed by: Roman Strashkin <roman.strashkin@nexenta.com>
Reviewed by: Steve Peng <steve.peng@nexenta.com>
Bug 11205: add missing libzfs_closed_stubs.c to fix opensource-only build.
ZFS plus work: special vdevs, cos, cos/vdev properties

*** 18,27 ****
--- 18,28 ----
  #
  # CDDL HEADER END
  #
  #
  # Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ # Copyright 2012 Nexenta Systems, Inc. All rights reserved.
  # Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>.
  # Copyright (c) 2015 by Delphix. All rights reserved.
  #
  
  PROG= zpool