message: fixes missing include
diff: @@ -40,6 +40,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  #include "benchmark/utils/formats.hpp"
  #include "benchmark/utils/general.hpp"
  #include "benchmark/utils/loggers.hpp"
  +#include "benchmark/utils/stencil_matrix.hpp"
  #if GINKGO_BUILD_MPI
  #include "benchmark/utils/distributed_helpers.hpp"
  #endif
  