message: fix signature for WriteGameExamples dummy implementation
diff: @@ -19,7 +19,9 @@ namespace minigo {
  namespace tf_utils {
  void WriteGameExamples(const std::string& output_dir,
  - const std::string& output_name, const Game& game) {
  + const std::string& output_name,
  + const FeatureDescriptor& feature_desc,
  + const Game& game) {
  MG_LOG(FATAL)
  << "Can't write TensorFlow examples without TensorFlow support enabled. "
  "Please recompile, passing --define=tf=1 to bazel build.";
  