message: fix Cilk compile error
diff: @@ -62,7 +62,7 @@ namespace ospcommon {
  return tbb::task_scheduler_init::default_num_threads();
  # endif
  #elif defined(OSPRAY_TASKING_CILK)
  - return numThreads >= 0 ? std::thread::hardware_concurrency();
  + return numThreads >= 0 ? numThreads : std::thread::hardware_concurrency();
  #elif defined(OSPRAY_TASKING_OMP)
  int threads = 0;
  #pragma omp parallel
  