message: sett if the internal tasking sytem works for Windows CI
diff: @@ -23,6 +23,7 @@ cmake -L ^
  -G "%~1" ^
  -T "%~2" ^
  -D OSPRAY_BUILD_ISA=ALL ^
  +-D OSPRAY_TASKING_SYSTEM=Internal ^
  -D OSPRAY_ENABLE_TESTING=ON ^
  -D OSPRAY_AUTO_DOWNLOAD_TEST_IMAGES=OFF ^
  -D OSPRAY_MODULE_BILINEAR_PATCH=ON ^
  