Default to clipper-intergraph if system is clix.

From-SVN: r3871

gcc/config.sub

@@ -83,6 +83,9 @@ case $os in
 		os=-isc2.2
 		basic_machine=`echo $1 | sed -e 's/86-.*/86-unknown/'`
 		;;
+	-clix*)
+		basic_machine=clipper-intergraph
+		;;
 	-isc*)
 		basic_machine=`echo $1 | sed -e 's/86-.*/86-unknown/'`
 		;;