seacas: Force use of non-mpi-enabled hdf5 (#18702)
seacas: Force use of non-mpi-enabled hdf5 (#18702)

Due to recent changes in the `netcdf-c` package, it is now necessary to explicitly request a non-mpi-enabled hdf5 build if building a non-mpi-enabled seacas.
iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack,LLNL/spack,LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack,iulian787/spack