hide UmfpackRunner, if umfpack is not available

dune/amdis/linear_algebra/mtl/BITL_Preconditioner.hpp

 #pragma once
 
+#include "itl/block_diagonal.hpp"
+
 #include <dune/amdis/CreatorMap.hpp>
 #include <dune/amdis/linear_algebra/mtl/ITL_Preconditioner.hpp>
-#include "itl/block_diagonal.hpp"
 
 namespace AMDiS
 {

dune/amdis/linear_algebra/mtl/BITL_Solver.hpp

@@ -67,10 +67,12 @@ namespace AMDiS
         
       auto gcr = new SolverCreator<gcr_type>;
       Map::addCreator("gcr", gcr);
-    
+      
+#ifdef HAVE_UMFPACK
       auto umfpack = new UmfpackSolverCreator;
       Map::addCreator("umfpack", umfpack);
       Map::addCreator("direct", umfpack);
+#endif
       
       Map::addCreator("default", gmres);
     }

dune/amdis/linear_algebra/mtl/ITL_Solver.hpp

@@ -460,9 +460,11 @@ namespace AMDiS
       auto preonly = new SolverCreator<preonly_type>;
       Map::addCreator("preonly", preonly);
     
+#ifdef HAVE_UMFPACK
       auto umfpack = new UmfpackSolverCreator;
       Map::addCreator("umfpack", umfpack);
       Map::addCreator("direct", umfpack);
+#endif
       
       Map::addCreator("default", gmres);
     }