message: Fix compilation issue with Protobuf > 3.11
  Same as
diff: @@ -166,7 +166,11 @@ CNNScorer::CNNScorer(const cnn_options &opts) :
  google::protobuf::io::ArrayInputStream weightdata(weights, nbytes);
  google::protobuf::io::CodedInputStream strm(&weightdata);
  +#if GOOGLE_PROTOBUF_VERSION >= 3006000
  + strm.SetTotalBytesLimit(INT_MAX);
  +#else
  strm.SetTotalBytesLimit(INT_MAX, 536870912);
  +#endif
  success = wparam.ParseFromCodedStream(&strm);
  if (!success)
  throw usage_error("Error with default weights.");
  