[PL] HM: Remove unnecessary HMProcess-fwd.h.

ProcessLib/HydroMechanics/HydroMechanicsProcess-fwd.h

-/**
- * \copyright
- * Copyright (c) 2012-2015, OpenGeoSys Community (http://www.opengeosys.org)
- *            Distributed under a Modified BSD License.
- *              See accompanying file LICENSE.txt or
- *              http://www.opengeosys.org/project/license
- *
- */
-
-#pragma once
-
-#include "HydroMechanicsProcess.h"
-
-extern template class ProcessLib::HydroMechanics::HydroMechanicsProcess<2>;
-extern template class ProcessLib::HydroMechanics::HydroMechanicsProcess<3>;

ProcessLib/HydroMechanics/HydroMechanicsProcess.cpp

@@ -8,7 +8,6 @@
  */
 
 #include "HydroMechanicsProcess.h"
-#include "HydroMechanicsProcess-fwd.h"
 
 namespace ProcessLib
 {