Revert "remove a strange non-ASCII character in _iomodule.c" (GH-17240)

This reverts commit bcc1cc5c,  which removed an intentionally placed
"form feed" character.

Modules/_io/_iomodule.c

@@ -503,7 +503,7 @@ _io_open_code_impl(PyObject *module, PyObject *path)
 {
     return PyFile_OpenCodeObject(path);
 }
-
+
 /*
  * Private helpers for the io module.
  */