include config.h

[[Imported from SVN: r1167]]

dune/istl/test/iotest.cc

 // -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 // vi: set et ts=4 sw=2 sts=2:
+#include "config.h"
 #include <dune/common/fmatrix.hh>
 #include <dune/istl/bcrsmatrix.hh>
 #include <dune/istl/io.hh>