message: fix cagpulib build without merger
diff: @@ -71,8 +71,10 @@ texture<signed short, 1, cudaReadModeElementType> gAliTexRefs;
  #include "AliHLTTPCCAStartHitsSorter.cxx"
  #include "AliHLTTPCCATrackletConstructor.cxx"
  +#ifdef HLTCA_GPU_MERGER
  #include "AliHLTTPCGMMerger.h"
  #include "AliHLTTPCGMTrackParam.cxx"
  +#endif
  #include "MemoryAssignmentHelpers.h"
  @@ -1546,6 +1548,10 @@ char* AliHLTTPCCAGPUTrackerNVCC::MergerBaseMemory()
  int AliHLTTPCCAGPUTrackerNVCC::RefitMergedTracks(AliHLTTPCGMMerger* Merger)
  {
  +#ifndef HLTCA_GPU_MERGER
  + HLTError("HLTCA_GPU_MERGER compile flag not set");
  + return(1);
  +#else
  if (!fCudaInitialized)
  {
  HLTError("GPU Merger not initialized");
  @@ -1615,8 +1621,8 @@ int AliHLTTPCCAGPUTrackerNVCC::RefitMergedTracks(AliHLTTPCGMMerger* Merger)
  }
  cuCtxPopCurrent((CUcontext*) fCudaContext);
  -
  return(0);
  +#endif
  }
  AliHLTTPCCAGPUTracker* AliHLTTPCCAGPUTrackerNVCCCreate()
  