10080 smatch Makefile changes for usr/src/cmd

*** 21,31 ****
  
  #
  # Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  # Copyright (c) 2012 by Delphix. All rights reserved.
! # Copyright 2017 Joyent, Inc.
  # Copyright 2017 RackTop Systems.
  #
  
  PROG:sh=        cd ..; basename `pwd`
  SRCS= ../$(PROG).c ../zdb_il.c
--- 21,31 ----
  
  #
  # Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  # Copyright (c) 2012 by Delphix. All rights reserved.
! # Copyright (c) 2018, Joyent, Inc.
  # Copyright 2017 RackTop Systems.
  #
  
  PROG:sh=        cd ..; basename `pwd`
  SRCS= ../$(PROG).c ../zdb_il.c
*** 52,61 ****
--- 52,63 ----
  # in Makefile.master
  CERRWARN += -_gcc=-Wmissing-braces
  CERRWARN += -_gcc=-Wsign-compare
  CERRWARN += -_gcc=-Wmissing-field-initializers
  
+ SMOFF += 64bit_shift,all_func_returns
+ 
  # lint complains about unused _umem_* functions
  LINTFLAGS += -xerroff=E_NAME_DEF_NOT_USED2
  LINTFLAGS64 += -xerroff=E_NAME_DEF_NOT_USED2
  
  # lint complains about unused inline functions, even though