ExtractParallelGridInfoToISTL: use forwarding

opm/simulators/linalg/ExtractParallelGridInformationToISTL.cpp

@@ -22,6 +22,8 @@
 #include <opm/simulators/linalg/ParallelIstlInformation.hpp>
 #include <dune/common/version.hh>
 #include <dune/common/shared_ptr.hh>
+#include <opm/grid/CpGrid.hpp>
+
  namespace Opm
 {
 #if defined(HAVE_OPM_GRID)

opm/simulators/linalg/ExtractParallelGridInformationToISTL.hpp

@@ -21,9 +21,10 @@
 #define OPM_EXTRACTPARALLELGRIDINFORMATIONTOISTL_HEADER_INCLUDED
 #ifdef HAVE_OPM_GRID
 
-#include<opm/grid/CpGrid.hpp>
 #include <any>
 
+namespace Dune { class CpGrid; }
+
 namespace Opm
 {