Makefile: Added back config.h handling in Makefile

Makefile

@@ -6,9 +6,12 @@ NAME=slstatus
 
 all: ${NAME}
 
-${NAME}:
+${NAME}: config.h
 	${CC} ${CFLAGS} -o $@ ${NAME}.c ${LDFLAGS}
 
+config.h:
+	cp config.def.h $@
+
 clean:
 	rm -f ${NAME}