improved 1984/mullender Makefile

Improved the warning with a make alt suggestion.

Also removed alt2 rule that was no longer needed.

1984/mullender/Makefile

@@ -131,8 +131,17 @@ all: data ${TARGET}
 	sandwich supernova deep_magic magic charon pluto
 
 ${PROG}: ${PROG}.c
-	@echo "Warning: this entry is likely to fail and/or dump core on any computer other"
+	@echo "Warning: this entry is likely to fail and/or dump core on any computer other" \
-	@echo "than a Vax-11 or pdp-11."
+	       "than a Vax-11 or pdp-11."
+	@echo
+	@echo "For the rest of us, we recommend:"
+	@echo
+	@echo "    make alt"
+	@echo
+	@echo "and then running:"
+	@echo
+	@echo "    ./ ${ALT_TARGET}"
+	@echo
 	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
 
 gentab: gentab.c
@@ -147,9 +156,6 @@ alt: data ${ALT_TARGET}
 ${PROG}.alt: ${PROG}.alt.c
 	${CC} -include stdio.h -include unistd.h -include stdlib.h ${CFLAGS} -Wno-implicit-int $< -o $@ ${LDFLAGS}
 
-${PROG}.alt2: ${PROG}.alt2.c
-	${CC} -include stdio.h -include unistd.h -include stdlib.h ${CFLAGS} -Wno-implicit-int $< -o $@ ${LDFLAGS}
-
 # data files
 #
 data: ${DATA}