10080 smatch Makefile changes for usr/src/cmd

*** 21,30 ****
--- 21,31 ----
  #
  #
  # Copyright 2003 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  #
+ # Copyright (c) 2018, Joyent, Inc.
  
  FSTYPE=         hsfs
  LIBPROG=        mount
  PROG=           $(LIBPROG)
  ROOTFS_PROG=    $(PROG)
*** 38,42 ****
--- 39,46 ----
  include         ../../Makefile.fstype
  include         ../../Makefile.mount
  include         ../../Makefile.mount.targ
  
  CERRWARN +=     -_gcc=-Wno-unused-variable
+ 
+ # not linted
+ SMATCH=off