Add version guards

Author: lysnikolaou

tornado/speedups.c

@@ -57,8 +57,12 @@ static PyMethodDef methods[] = {
 };
 
 static PyModuleDef_Slot slots[] = {
+#if PY_VERSION_HEX >= 0x030c0000
     {Py_mod_multiple_interpreters, Py_MOD_PER_INTERPRETER_GIL_SUPPORTED},
+#endif
+#if PY_VERSION_HEX >= 0x030d0000
     {Py_mod_gil, Py_MOD_GIL_NOT_USED},
+#endif
     {0, NULL}
 };