Fix segfault in 1984/laman without an arg

1984/laman/Makefile

@@ -159,8 +159,6 @@ all: data ${TARGET}
 	supernova deep_magic magic charon pluto
 
 ${PROG}: ${PROG}.c
-	@echo "NOTE: this entry will likely dump core without an arg and it will not work without"
-	@echo "a positive number."
 	${CC} ${CFLAGS} $< -o $@ ${LIBS}
 
 # alternative executable