Revert "Merge branch 'feature/support_gcc_v8.x' into 'master'"

This reverts merge request !1539

components/newlib/platform_include/esp_newlib.h

@@ -1,39 +0,0 @@
-// Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef _ESP_NEWLIB_H
-#define _ESP_NEWLIB_H
-
-#include <reent.h>
-
-/*
- * @brief Initialize global and thread's private reent object data. We add this instead of
- *        newlib's initialization function to avoid some unnecessary cost and unused function.
- * 
- * @param r reent pointer
- * 
- * @return none
- */
-void esp_reent_init(struct _reent* r);
-
-/*
- * @brief Initialize newlib's platform object data
- * 
- * @param none
- * 
- * @return 0 if successful or -1 if failed
- */
-int esp_newlib_init(void);
-
-#endif