message: add more missing headers to install
diff: @@ -155,6 +155,7 @@ else()
  ospray_install_sdk_headers(
  tasking/async.h
  tasking/parallel_for.h
  + tasking/parallel_foreach.h
  tasking/schedule.h
  tasking/tasking_system_handle.h
  @@ -171,20 +172,22 @@ else()
  ospray_install_sdk_headers(
  utility/Any.h
  + utility/ArgumentList.h
  utility/ArrayView.h
  utility/CodeTimer.h
  utility/DataView.h
  utility/demangle.h
  utility/DoubleBufferedValue.h
  utility/getEnvVar.h
  + utility/Observer.h
  utility/OnScopeExit.h
  utility/Optional.h
  utility/ParameterizedObject.h
  utility/PseudoURL.h
  utility/SaveImage.h
  utility/StringManip.h
  - utility/TransactionalValue.h
  utility/TimeStamp.h
  + utility/TransactionalValue.h
  DESTINATION ${OSPCOMMON_SDK_INSTALL_LOC}/utility
  )
  