Always set __builtins__ in _PyFunction_FromXIData().

Author: ericsnowcurrently

Python/crossinterp_data_lookup.h

@@ -701,6 +701,13 @@ _PyFunction_FromXIData(_PyXIData_t *xidata)
         Py_DECREF(code);
         return NULL;
     }
+    PyThreadState *tstate = _PyThreadState_GET();
+    if (PyDict_SetItemString(globals, "__builtins__",
+                             tstate->interp->builtins) < 0)
+    {
+        Py_DECREF(globals);
+        return NULL;
+    }
     PyObject *func = PyFunction_New(code, globals);
     Py_DECREF(code);
     Py_DECREF(globals);