Code review comment for lp:~widelands-dev/widelands/compiler_warnings_062017

Are sou still seeing the warning below? If so, I will remove the extra includes, because added code that serves no purpose is not good.

src/wui/interactive_base.cc:168:34: warning: instantiation of function
      'Widelands::MapTriangleRegion<Widelands::TCoords<Widelands::Coords>, unsigned short>::MapTriangleRegion' required here, but no definition is available
      [-Wundefined-func-template]
                Widelands::MapTriangleRegion<> mr(map, Area<TCoords<>>(center.triangle, sel_.radius));