Add broad definition for c_bool constructor (#14841)

stdlib/_typeshed/__init__.pyi

@@ -142,6 +142,9 @@ class SupportsIter(Protocol[_T_co]):
 class SupportsAiter(Protocol[_T_co]):
     def __aiter__(self) -> _T_co: ...
 
+class SupportsLen(Protocol):
+    def __len__(self) -> int: ...
+
 class SupportsLenAndGetItem(Protocol[_T_co]):
     def __len__(self) -> int: ...
     def __getitem__(self, k: int, /) -> _T_co: ...