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

This reverts merge request !1539

components/newlib/platform_include/sys/un.h

@@ -1,22 +0,0 @@
-// Copyright 2020 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.
-
-#pragma once
-
-#define	AF_UNIX		1		/* local to host (pipes) */
-
-struct sockaddr_un {
-            short                    sun_family;                /*AF_UNIX*/
-            char                     sun_path[108];             /*path name */
-};