message: use relative path for Device.h includes to remove include path requirements
diff: #include "ospcommon/utility/ParameterizedObject.h"
  // ospray
  #include "../common/OSPCommon.h"
  -#include "common/Util.h"
  +#include "../common/Util.h"
  #include "ospray/version.h"
  // std
  #include <functional>
  