message: fix compilation on non-windows
  A better fix would be to not compile the file in the first place, but let's start with valid C++ code for now
diff: @@ -997,7 +997,7 @@ int read_etl_file( const char *file, StrPool &strpool, trace_info_t &trace_info,
  // Stub implementation for non-windows OSs
  int read_etl_file( const char *file, StrPool &strpool, trace_info_t &trace_info, EventCallback &cb )
  {
  - return -1
  + return -1;
  }
  #endif
  