Merge branch 'change/remove-sys_dirent_h-include' into 'master'

change(newlib): prepare dirent.h to remove

Closes IDF-10675 and LLVM-330

See merge request espressif/esp-idf!41608

docs/en/migration-guides/release-6.x/6.0/toolchain.rst

@@ -93,6 +93,39 @@ Warn when an explicitly defaulted function is deleted by the compiler. That can
        C(const C&&) = default; /* Implicitly deleted.  */
     };
 
+``sys/dirent.h`` No Longer Includes Function Prototypes
+-------------------------------------------------------
+
+Issue
+^^^^^^
+
+Compilation errors may occur in code that previously worked with the old toolchain. For example:
+
+.. code-block:: c
+
+    #include <sys/dirent.h>
+    /* .... */
+    DIR* dir = opendir("test_dir");
+    /* .... */
+    /**
+     * Compile error:
+     * test.c: In function 'test_opendir':
+     * test.c:100:16: error: implicit declaration of function 'opendir' [-Werror=implicit-function-declaration]
+     *   100 |     DIR* dir = opendir(path);
+     *       |                ^~~~~~~
+     */
+
+Solution
+^^^^^^^^^
+
+To resolve this issue, the correct header must be included. Refactor the code like this:
+
+.. code-block:: c
+
+    #include <dirent.h>
+    /* .... */
+    DIR* dir = opendir("test_dir");
+
 Picolibc
 --------