message: fix silly compile error on MSVC 12
diff: @@ -30,7 +30,7 @@ namespace ospray {
  void initWorkMap()
  {
  - Work::WORK_MAP = {
  + Work::WORK_MAP = Work::WorkMap{
  { REGISTER_WORK_UNIT(NewObject<Renderer>) },
  { REGISTER_WORK_UNIT(NewObject<Model>) },
  { REGISTER_WORK_UNIT(NewObject<Geometry>) },
  