message: Restore again the possibility to compile with C++17
diff: #include "AliJJet.h"
  #include "AliAnalysisTaskRidge.h"
  #include <AliDirList.h>
  +#include <random>
  using namespace std;
  @@ -1085,8 +1086,9 @@ void AliAnalysisTaskRidge::FillTracks(){
  }
  }
  -
  - std::random_shuffle ( goodtrackindices.begin(), goodtrackindices.end() );
  + std::random_device rd;
  + std::default_random_engine engine{rd()};
  + std::shuffle ( goodtrackindices.begin(), goodtrackindices.end(), engine );
  double MaxPhi=0;
  @@ -1472,7 +1474,9 @@ void AliAnalysisTaskRidge::FillTracklets(){
  }
  //eta is in ordering, so detaleta is always negative. solution -> Shuffle
  - std::random_shuffle ( goodtrackindices.begin(), goodtrackindices.end() );
  + std::random_device rd;
  + std::default_random_engine engine{rd()};
  + std::shuffle ( goodtrackindices.begin(), goodtrackindices.end(), engine );
  fMultiplicity = fEvt -> GetMultiplicity();
  const UInt_t ntracks = goodtrackindices.size();
  