RFE: Support HDF5 1.12 API

[opoplawski]

When building with hdf5 1.12.1 I get:

In file included from /usr/include/H5public.h:32,
                 from /usr/include/hdf5.h:22,
                 from grads.h:13,
                 from gaio.c:19:
gaio.c: In function 'h5pattrs':
gaio.c:4778:10: error: too few arguments to function 'H5Oget_info3'
 4778 |     rc = H5Oget_info(vid,&oinfo);
      |          ^~~~~~~~~~~

Must use -DH5_USE_110_API to work around it.