Fix build with latest ROOT by switching to std::unordered_{set,map}.

Hlt/IndependenceTests/Independence/DecisionMap.h

 // $Id: $
-#ifndef DECISIONMAP_H 
+#ifndef DECISIONMAP_H
 #define DECISIONMAP_H 1
 
 // Include files
 #include <memory>
+#include <unordered_map>
+#include <unordered_set>
 
 // boost
-#include <boost/unordered_map.hpp>
-#include <boost/unordered_set.hpp>
+#include <boost/functional/hash.hpp>
 
 /** @class DecisionMap DecisionMap.h
- *  
+ *
  *
  *  @author Roel Aaij
  *  @date   2010-03-26
  */
 class DecisionMap {
-public: 
+public:
    /// Standard constructor
 
-   typedef std::pair< unsigned int, unsigned int > eventKey_t;
+   using eventKey_t = std::pair<unsigned int, unsigned int>;
 
-   DecisionMap( ); 
+   DecisionMap( );
 
    virtual ~DecisionMap( ); ///< Destructor
 
@@ -43,8 +44,8 @@ public:
 
 private:
 
-   typedef boost::unordered_set< std::string > decisions_t;
-   typedef boost::unordered_map< eventKey_t, decisions_t > decisionMap_t;
+   using decisions_t = std::unordered_set<std::string> ;
+   using decisionMap_t = std::unordered_map<eventKey_t, decisions_t, boost::hash<eventKey_t>>;
    decisionMap_t* m_map;
 
    // caching