message: add gpu merger if set in config file
diff: @@ -177,7 +177,9 @@ int AliHLTTPCCAStandaloneFramework::ProcessEvent(int forceSingleSlice)
  fMerger.SetSliceData( i, fSliceOutput[i] );
  }
  - //fMerger.SetGPUTracker(fTracker.GetGPUTracker());
  +#ifdef HLTCA_GPU_MERGER
  + fMerger.SetGPUTracker(fTracker.GetGPUTracker());
  +#endif
  fMerger.Reconstruct();
  }
  