message: Added guard for an function related to periodic meshes
  Credit: B. Han pointed this out in the PR review.
diff: @@ -795,6 +795,8 @@ TEST(sidre_datacollection, dc_par_reload_mesh_2D_large)
  testParallelMeshReloadAllPartitionings(mesh);
  }
  + // The following test requires a function from mfem@4.3
  + #if(MFEM_VERSION >= 40300)
  TEST(sidre_datacollection, dc_par_reload_mesh_2D_periodic)
  {
  // periodic 2D mesh divided into triangles
  @@ -812,6 +814,7 @@ TEST(sidre_datacollection, dc_par_reload_mesh_2D_periodic)
  auto mesh = mfem::Mesh::MakePeriodic(base_mesh, vertex_map);
  testParallelMeshReloadAllPartitionings(mesh);
  }
  + #endif
  TEST(sidre_datacollection, dc_par_reload_mesh_3D_small_tet)
  {
  