8516 Suppress gcc errors with -Wno- in Makefile for usr/src/cmd

@@ -16,10 +16,11 @@
 # fields enclosed by brackets "[]" replaced with your own identifying
 # information: Portions Copyright [yyyy] [name of copyright owner]
 #
 # CDDL HEADER END
 #
+# Copyright 2017 Gary Mills
 # Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 # Use is subject to license terms.
 #
 
 PROG=           syslogd

@@ -39,10 +40,13 @@
 CFLAGS          += -DNDEBUG
 
 # there's some extra utility code defined but not used.
 LINTFLAGS       += -erroff=E_NAME_DEF_NOT_USED2
 
+# Suppress error for: prev
+list.o          := CERRWARN += -_gcc=-Wno-unused-but-set-variable
+
 VARSYSLOG=      syslog
 VARAUTHLOG=     authlog
 ROOTVARLOGD=    $(ROOT)/var/log
 
 ROOTETCCONFIG=  $(CONFIGFILE:%=$(ROOTETC)/%)