fix [#27683] Blender hangs when baking a particle system when a driver is present

source/blender/python/generic/py_capi_utils.h

@@ -50,4 +50,6 @@ void PyC_MainModule_Restore(PyObject *main_mod);
 
 void PyC_SetHomePath(const char *py_path_bundle);
 
+#define PYC_INTERPRETER_ACTIVE (((PyThreadState*)_Py_atomic_load_relaxed(&_PyThreadState_Current)) != NULL)
+
 #endif // PY_CAPI_UTILS_H