message: Remove no longer used extern declaration
diff: @@ -37,7 +37,6 @@ const std::string MAP_TERRAIN_EXTENSION = "_a.png";
  const std::string MAP_DISPLAY_EXTENSION = "_b.png";
  extern Point<int> MOUSE_COORDS;
  -extern MainReportsUiState* MAIN_REPORTS_UI;
  int ROBOT_ID_COUNTER = 0; /// \fixme Kludge
  