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

This reverts merge request !1539

components/newlib/platform_include/sys/poll.h

@@ -1,48 +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_PLATFORM_SYS_POLL_H_
-#define _ESP_PLATFORM_SYS_POLL_H_
-
-#define POLLIN      (1u << 0)      /* data other than high-priority may be read without blocking */
-#define POLLRDNORM  (1u << 1)      /* normal data may be read without blocking */
-#define POLLRDBAND  (1u << 2)      /* priority data may be read without blocking */
-#define POLLPRI     (POLLRDBAND)   /* high-priority data may be read without blocking */
-// Note: POLLPRI is made equivalent to POLLRDBAND in order to fit all these events into one byte
-#define POLLOUT     (1u << 3)      /* normal data may be written without blocking */
-#define POLLWRNORM  (POLLOUT)      /* equivalent to POLLOUT */
-#define POLLWRBAND  (1u << 4)      /* priority data my be written */
-#define POLLERR     (1u << 5)      /* some poll error occurred */
-#define POLLHUP     (1u << 6)      /* file descriptor was "hung up" */
-#define POLLNVAL    (1u << 7)      /* the specified file descriptor is invalid */
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-struct pollfd {
-    int fd;        /* The descriptor. */
-    short events;  /* The event(s) is/are specified here. */
-    short revents; /* Events found are returned here. */
-};
-
-typedef unsigned int nfds_t;
-
-int poll(struct pollfd *fds, nfds_t nfds, int timeout);
-
-#ifdef __cplusplus
-} // extern "C"
-#endif
-
-#endif // _ESP_PLATFORM_SYS_POLL_H_