Now use H5Literate2() instead of H5Literate() when its available

configure.ac

@@ -1618,13 +1618,13 @@ if test "x$enable_hdf5" = xyes; then
    # H5Pset_fapl_mpiposix and H5Pget_fapl_mpiposix have been removed since HDF5 1.8.12.
    # Use H5Pset_fapl_mpio and H5Pget_fapl_mpio, instead.
 
-   AC_CHECK_FUNCS([H5Pget_fapl_mpio H5Pset_deflate H5Z_SZIP H5Pset_all_coll_metadata_ops H5Literate])
+   AC_CHECK_FUNCS([H5Pget_fapl_mpio H5Pset_deflate H5Z_SZIP H5Pset_all_coll_metadata_ops H5Literate H5Literate2])
 
    # Check to see if HDF5 library has collective metadata APIs, (HDF5 >= 1.10.0)
    if test "x$ac_cv_func_H5Pset_all_coll_metadata_ops" = xyes; then
       AC_DEFINE([HDF5_HAS_COLL_METADATA_OPS], [1], [if true, use collective metadata ops in parallel netCDF-4])
    fi
-
+ 
    # If parallel is available in hdf5, enable it in the C code. Also add some stuff to netcdf.h.
    if test "x$ac_cv_func_H5Pget_fapl_mpio" = xyes -o "x$ac_cv_func_H5Pget_fapl_mpiposix" = xyes; then
       hdf5_parallel=yes

libhdf5/hdf5open.c

@@ -2857,9 +2857,15 @@ rec_read_metadata(NC_GRP_INFO_T *grp)
      * passed as a parameter to the callback function
      * read_hdf5_obj(). (I have also tried H5Oiterate(), but it is much
      * slower iterating over the same file - Ed.) */
+#ifdef HAVE_H5LITERATE2
+    if (H5Literate2(hdf5_grp->hdf_grpid, iter_index, H5_ITER_INC, &idx,
+                   read_hdf5_obj, (void *)&udata) < 0)
+        BAIL(NC_EHDFERR);
+#else
     if (H5Literate(hdf5_grp->hdf_grpid, iter_index, H5_ITER_INC, &idx,
                    read_hdf5_obj, (void *)&udata) < 0)
         BAIL(NC_EHDFERR);
+#endif
 
     /* Process the child groups found. (Deferred until now, so that the
      * types in the current group get processed and are available for