adding missing includes

builtins/3/atexit.pyi

@@ -1,18 +1,7 @@
 """Stub file for the 'atexit' module."""
-# This is an autogenerated file. It serves as a starting point
-# for a more precise manual annotation of this module.
-# Feel free to edit the source below, but remove this header when you do.
-
-from typing import Any, List, Tuple, Dict, Generic
 
 def _clear() -> None: ...
-
-def _ncallbacks() -> long: ...
-
+def _ncallbacks() -> int: ...
 def _run_exitfuncs() -> None: ...
-
-def register(*args, **kwargs) -> Any:
-    raise MemoryError()
-    raise TypeError()
-
-def unregister(*args, **kwargs) -> None: ...
+def register(func: Callable[..., Any], *args, **kwargs) -> Callable[..., Any]: ...
+def unregister(func: Callable[..., Any]) -> None: ...