message: Fix a crashing issue of Android logging
  Avoid using std::cerr.
  Tested with //tensorflow/lite/tools/benchmark:benchmark_model_plus_flex
diff: @@ -229,7 +229,7 @@ void LogMessage::GenerateLogMessage() {
  __android_log_write(android_log_level, "native", ss.str().c_str());
  // Also log to stderr (for standalone Android apps).
  - std::cerr << "native : " << ss.str() << std::endl;
  + fprintf(stderr, "native : %s\n", ss.str().c_str());
  // Android logging at level FATAL does not terminate execution, so abort()
  // is still required to stop the program.
  