Remove allowlist entries for _ctypes on win (#10855)

stdlib/_ctypes.pyi

@@ -44,6 +44,8 @@ if sys.platform == "win32":
     def FormatError(code: int = ...) -> str: ...
     def get_last_error() -> int: ...
     def set_last_error(value: int) -> int: ...
+    def LoadLibrary(__name: str, __load_flags: int = 0) -> int: ...
+    def FreeLibrary(__handle: int) -> None: ...
 
 class _CDataMeta(type):
     # By default mypy complains about the following two methods, because strictly speaking cls