Fix casting incompatibility

Co-authored-by: Petr Viktorin <encukou@gmail.com>

Author: bschoenmaeckers

Include/boolobject.h

@@ -12,8 +12,10 @@ extern "C" {
 #if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= _Py_PACK_VERSION(3, 16)
 PyAPI_FUNC(int) PyBool_Check(PyObject *x);
 #endif
-#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 < 0x03100000
+#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 < _Py_PACK_VERSION(3, 16)
 #  define PyBool_Check(x) Py_IS_TYPE((x), &PyBool_Type)
+#else
+#  define PyBool_Check(x) PyBool_Check(_PyObject_CAST(x))
 #endif
 
 /* Py_False and Py_True are the only two bools in existence. */