Update IDF to a0468b2 (#2108)

* Update IDF to a0468b2

* add missing ld file

* Fix PIO builds and change coex policy

tools/sdk/include/newlib/errno.h

@@ -1,39 +1,11 @@
+#ifndef __ERRNO_H__
+#define __ERRNO_H__
 
-// 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_PLATFORM_ERRNO_H_
-#define _ESP_PLATFORM_ERRNO_H_
-
-#include_next "errno.h"
-
-//
-// Possibly define some missing errors
-//
-#ifndef ESHUTDOWN
-#define ESHUTDOWN      108  /* Cannot send after transport endpoint shutdown */
+#ifndef __error_t_defined
+typedef int error_t;
+#define __error_t_defined 1
 #endif
 
-#ifndef EAI_SOCKTYPE
-#define	EAI_SOCKTYPE	10	/* ai_socktype not supported */
-#endif
+#include <sys/errno.h>
 
-#ifndef EAI_AGAIN
-#define	EAI_AGAIN	     2   /* temporary failure in name resolution */
-#endif
-
-#ifndef EAI_BADFLAGS
-#define	EAI_BADFLAGS	 3	 /* invalid value for ai_flags */
-#endif
-
-#endif // _ESP_PLATFORM_ERRNO_H_
+#endif /* !__ERRNO_H__ */