Remove destructor overrides identical destructor in a base class

Found by Cppcheck uselessOverride).

dune/istl/operators.hh

@@ -118,9 +118,6 @@ namespace Dune {
 
     //! get matrix via *
     virtual const M& getmat () const = 0;
-
-    //! every abstract base class has a virtual destructor
-    virtual ~AssembledLinearOperator () {}
   };
 
 

dune/istl/repartition.hh

@@ -298,9 +298,6 @@ namespace Dune
       }
     }
 
-    ~RedistributeInterface()
-    {}
-
   };
 
   namespace