fix symbol issue

Author: corona10

Include/internal/pycore_dict.h

@@ -149,7 +149,7 @@ extern int _PyDict_GetItemRef_KnownHash(PyDictObject *op, PyObject *key, Py_hash
 extern int _PyDict_GetItemRef_Unicode_LockHeld(PyDictObject *op, PyObject *key, PyObject **result);
 PyAPI_FUNC(int) _PyObjectDict_SetItem(PyTypeObject *tp, PyObject *obj, PyObject **dictptr, PyObject *name, PyObject *value);
 
-extern int _PyFrozenDict_GetItemRef(PyObject *op, PyObject *key, PyObject **result);
+PyAPI_FUNC(int) _PyFrozenDict_GetItemRef(PyObject *op, PyObject *key, PyObject **result);
 
 extern int _PyDict_Pop_KnownHash(
     PyDictObject *dict,