improve how -traditional-cpp is forced for 1986/wall

1986/wall/Makefile

@@ -172,9 +172,8 @@ TARGET= ${PROG}
 ALT_OBJ=
 ALT_TARGET=
 
-# FORCE use of gcc -traditional-cpp
+# FORCE use of -traditional-cpp
 #
-CC:= gcc
 CFLAGS+= -traditional-cpp
 
 
@@ -190,8 +189,7 @@ all: ${DATA} ${TARGET}
 	supernova deep_magic magic charon pluto
 
 ${PROG}: ${PROG}.c
-	@echo "NOTE: This entry will not compile when using clang because it does not support"
-	@echo "      -traditional-cpp but it should compile with gcc."
+	@echo "NOTE: This entry requires a compiler that supports -traditional-cpp"
 	${CC} ${CFLAGS} $< -o $@ ${LIBS}
 
 # alternative executable