break double-inclusion-protection

[[Imported from SVN: r6186]]

dune/common/dynmatrix.hh

 // -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 // vi: set et ts=4 sw=2 sts=2:
 // $Id: fmatrix.hh 6181 2010-10-13 18:53:40Z christi $
-#ifndef DUNE_FMATRIX_HH
-#define DUNE_FMATRIX_HH
+#ifndef DUNE_DYNMATRIX_HH
+#define DUNE_DYNMATRIX_HH
 
 #include <cmath>
 #include <cstddef>