The external Alugrid library is not supported anymore

Use dune-alugrid instead, where the flags don't have to be added manually

dune/subgrid/test/CMakeLists.txt

@@ -31,10 +31,6 @@ add_dune_alberta_flags(test-w-albertagrid2d GRIDDIM 2 WORLDDIM 2)
 add_dune_alberta_flags(test-w-albertagrid3d GRIDDIM 3 WORLDDIM 3)
 endif(ALBERTA_FOUND )
 
-if(ALUGRID_FOUND)
-add_dune_alugrid_flags(test-w-alugrid )
-endif(ALUGRID_FOUND )
-
 if(UG_FOUND)
 add_dune_ug_flags(test-w-ug )
 endif(UG_FOUND )