Remove bad 'w' flag from rm in diffutils

package/diffutils/diffutils.mk

@@ -110,7 +110,7 @@ endif
 ifneq ($(BR2_HAVE_MANPAGES),y)
 	rm -rf $(TARGET_DIR)/usr/share/man
 endif
-	rm -rfw $(TARGET_DIR)/share/locale
+	rm -rf $(TARGET_DIR)/share/locale
 	rm -rf $(TARGET_DIR)/usr/share/doc
 
 diffutils: uclibc $(TARGET_DIR)/$(DIFFUTILS_TARGET_BINARY)