Various ctypes improvements (#11186)

Mostly more attention paid to which classes are actually the same class

stdlib/_ctypes.pyi

@@ -2,7 +2,7 @@ import sys
 from _typeshed import ReadableBuffer, WriteableBuffer
 from abc import abstractmethod
 from collections.abc import Callable, Iterable, Iterator, Mapping, Sequence
-from ctypes import CDLL
+from ctypes import CDLL, ArgumentError as ArgumentError
 from typing import Any, ClassVar, Generic, TypeVar, overload
 from typing_extensions import Self, TypeAlias
 
@@ -201,8 +201,6 @@ class Array(_CData, Generic[_CT]):
     if sys.version_info >= (3, 9):
         def __class_getitem__(cls, item: Any) -> GenericAlias: ...
 
-class ArgumentError(Exception): ...
-
 def addressof(obj: _CData) -> int: ...
 def alignment(obj_or_type: _CData | type[_CData]) -> int: ...
 def get_errno() -> int: ...