make compile without ElementType.

[[Imported from SVN: r6374]]

dune/common/test/deprtuplestest.cc

@@ -39,7 +39,9 @@ void test(T& tuple)
   c = Element<3>::get(tuple);
   std::string s;
   s = Element<4>::get(tuple);
-  typename ElementType<4,typename remove_const<T>::type>::Type s2 = Element<4>::get(tuple);
+
+  typedef typename tuple_element<4, typename remove_const<T>::type> :: type Type4 ;
+  Type4 s2 = Element<4>::get(tuple);
 }
 
 int iteratorTupleTest()