10079 smatch Makefile changes for usr/src/lib

*** 20,29 ****
--- 20,30 ----
  #
  #
  # Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  #
+ # Copyright (c) 2018, Joyent, Inc.
  
  LIBRARY= libvscan.a
  VERS= .1
  
  OBJECTS= libvscan.o
*** 39,48 ****
--- 40,51 ----
  
  LDLIBS += -lc -lscf -lsecdb -lm
  CFLAGS += $(CCVERBOSE)
  CPPFLAGS += -I$(SRCDIR)
  
+ SMOFF += signed
+ 
  .KEEP_STATE:
  
  all: $(LIBS)
  lint: lintcheck