- wipe config related files in distclean

Makefile

@@ -244,7 +244,8 @@ distclean:
 ifeq ($(DL_DIR),$(BASE_DIR)/dl)
 	rm -rf $(DL_DIR)
 endif
-	rm -rf $(BUILD_DIR) $(LINUX_KERNEL) $(IMAGE)
+	rm -rf $(BUILD_DIR) $(LINUX_KERNEL) $(IMAGE) $(BASE_DIR)/include \
+		.config.cmd
 	$(MAKE) -C $(CONFIG) clean
 
 sourceball: