message: Update PWGMMMultLinkDef.h
  On line number 7, I have added two class
  AliPMDpPbAnalysisTaskData
  AliPMDpPbAnalysisTaskSim
diff: #pragma link off all functions;
  #pragma link C++ class AliAnalysisPseudoRapidityDensity+;
  +#pragma link C++ class AliPMDpPbAnalysisTaskData+;
  +#pragma link C++ class AliPMDpPbAnalysisTaskSim+;
  #endif /* __CINT__ */
  