10080 smatch Makefile changes for usr/src/cmd

*** 1,7 ****
--- 1,8 ----
  #
  # Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ # Copyright (c) 2018, Joyent, Inc.
  #
  
  #
  # BSD 3 Clause License
  #
*** 49,58 ****
--- 50,62 ----
  CPPFLAGS += $(LFLAGS64)
  
  CPPFLAGS += -D_FILE_OFFSET_BITS=64 -DDEBUG
  CPPFLAGS += -I. -Iinclude
  
+ # not linted
+ SMATCH=off
+ 
  CSTD = $(CSTD_GNU99)
  
  # lint does not like unused _umem_*_init
  LINTFLAGS += -xerroff=E_NAME_DEF_NOT_USED2