gh-140126: Fix compile error if --with-assertions is enabled (#140133)

The `types_world_is_stopped()` function needs to be defined if NDEBUG
is not defined.

Author: nascheme

Objects/typeobject.c

@@ -81,7 +81,7 @@ class object "PyObject *" "&PyBaseObject_Type"
 
 #define END_TYPE_DICT_LOCK() Py_END_CRITICAL_SECTION2()
 
-#ifdef Py_DEBUG
+#ifndef NDEBUG
 // Return true if the world is currently stopped.
 static bool
 types_world_is_stopped(void)