Fewer g++ -Wunused-variable warnings

Author: rfschtkt

training/lstmtraining.cpp

@@ -173,10 +173,6 @@ int main(int argc, char **argv) {
     return 1;
   }
 
-  bool best_dumped = true;
-  char* best_model_dump = nullptr;
-  size_t best_model_size = 0;
-  STRING best_model_name;
   tesseract::LSTMTester tester(static_cast<inT64>(FLAGS_max_image_MB) *
                                1048576);
   tesseract::TestCallback tester_callback = nullptr;