for building libs you _must_ include config.h

[[Imported from SVN: r2960]]

grid/alu3dgrid/faceutility.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 "faceutility.hh"
 
 namespace Dune {