[release][repartition][bugfix] correct implementation of usage of ParMetis::idx_t for

different versions of ParMetis.

(cherry picked from commit b14c2447)
Signed-off-by: Steffen Müthing <muething@dune-project.org>

dune/istl/repartition.hh

@@ -648,15 +648,6 @@ namespace Dune
       return F::contains(pindex->local().attribute());
     }
 
-#if HAVE_PARMETIS
-#if PARMETIS_MAJOR_VERSION > 3
-    typedef idx_t idxtype;
-#elif defined(METISNAMEL)
-    typedef int idxtype;
-#else
-    //typedef std::size_t idxtype;
-    typedef int idxtype;
-#endif
 
     class BaseEdgeFunctor
     {
@@ -781,6 +772,7 @@ namespace Dune
                           Dune::OwnerOverlapCopyCommunication<T1,T2>*& outcomm,
                           RedistributeInterface& redistInf,
                           bool verbose=false);
+#if HAVE_PARMETIS
 #ifndef METIS_VER_MAJOR
   extern "C"
   {