AMG backend: add missing include

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@10173 2fb0f335-1f38-0410-981e-8018bf24f1b0

dumux/linear/amgbackend.hh

@@ -35,6 +35,7 @@
 
 #include <dumux/implicit/box/boxproperties.hh>
 #include <dumux/implicit/cellcentered/ccproperties.hh>
+#include <dumux/decoupled/common/pressureproperties.hh>
 #include "linearsolverproperties.hh"
 
 namespace Dumux {