Fix warning in 2001/bellard/Makefile

Having a '\' at the EOL of an echo followed by the rest of the string on
the next line will obviously not work as the '\' doesn't start a new
command but continues it (scripts notwithstanding). I am not sure how
this even got there but it resulted in a very long line of output.

2001/bellard/Makefile

@@ -135,8 +135,8 @@ all: data ${TARGET}
 	sandwich supernova deep_magic magic charon pluto
 
 ${PROG}: ${PROG}.c
-	@echo "WARNING: This must be compiled as a 32-bit binary and run" \
-	      "under i386 Linux in 32-bit mode, or this entry will not work!"
+	@echo "WARNING: This must be compiled as a 32-bit binary and run"
+	@echo "under i386 Linux in 32-bit mode, or this entry will not work!"
 	@echo
 	${CC} ${CFLAGS} -m32 $< -o $@ ${LDFLAGS}