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

This reverts merge request !1539

components/newlib/platform_include/sys/select.h

@@ -1,37 +0,0 @@
-// Copyright 2018 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_SYS_SELECT_H__
-#define __ESP_SYS_SELECT_H__
-
-/* Newlib 2.2.0 does not provide sys/select.h, and fd_set is defined in sys/types.h */
-#include <sys/types.h>
-#ifndef fd_set
-#include_next <sys/select.h>
-#else // fd_set
-#include <sys/time.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *errorfds, struct timeval *timeout);
-
-#ifdef __cplusplus
-} // extern "C"
-#endif
-
-#endif // fd_set
-
-#endif //__ESP_SYS_SELECT_H__