Issue #14153 Create _Py_device_encoding() to prevent _io from having to import
the os module.
diff --git a/Include/fileutils.h b/Include/fileutils.h
index 2fade9b..7c18cf2 100644
--- a/Include/fileutils.h
+++ b/Include/fileutils.h
@@ -5,6 +5,8 @@
 extern "C" {
 #endif
 
+PyAPI_FUNC(PyObject *) _Py_device_encoding(int);
+
 PyAPI_FUNC(wchar_t *) _Py_char2wchar(
     const char *arg,
     size_t *size);