[utilitytest.cc] Include config.h.

This makes the test fail with -std=c++0x.

[[Imported from SVN: r6067]]

dune/common/test/utilitytest.cc

 // -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 // vi: set et ts=4 sw=2 sts=2:
 
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <dune/common/tuples.hh>
 #include <dune/common/utility.hh>
 #include <iostream>