bpo-41986: Add Py_FileSystemDefaultEncodeErrors and Py_UTF8Mode back to limited API (GH-22621)

diff --git a/Include/fileobject.h b/Include/fileobject.h
index 456887e..6ec2994 100644
--- a/Include/fileobject.h
+++ b/Include/fileobject.h
@@ -20,8 +20,15 @@
    If non-NULL, this is different than the default encoding for strings
 */
 PyAPI_DATA(const char *) Py_FileSystemDefaultEncoding;
+#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03060000
+PyAPI_DATA(const char *) Py_FileSystemDefaultEncodeErrors;
+#endif
 PyAPI_DATA(int) Py_HasFileSystemDefaultEncoding;
 
+#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03070000
+PyAPI_DATA(int) Py_UTF8Mode;
+#endif
+
 /* A routine to check if a file descriptor can be select()-ed. */
 #ifdef _MSC_VER
     /* On Windows, any socket fd can be select()-ed, no matter how high */