Remove types.__all__

`from types import *` will ignore underscore-prefixed names by default, so defining `__all__` doesn't add anything.

Author: AA-Turner

Lib/types.py

@@ -332,5 +332,3 @@ def wrapped(*args, **kwargs):
 EllipsisType = type(Ellipsis)
 NoneType = type(None)
 NotImplementedType = type(NotImplemented)
-
-__all__ = [n for n in globals() if not n.startswith('_')]