[GLVis] Add new version: 3.4 (#8454)
[GLVis] Add new version: 3.4 (#8454)

* [glvis] Add new version, 3.4; update all checksums to be SHA-256.

* [GLVis] Use the new bit.ly short link for v3.4.

matthiasdiener/spack,iulian787/spack,matthiasdiener/spack,krafczyk/spack,iulian787/spack,LLNL/spack,krafczyk/spack,LLNL/spack,krafczyk/spack,krafczyk/spack,mfherbst/spack,matthiasdiener/spack,iulian787/spack,LLNL/spack,krafczyk/spack,iulian787/spack,iulian787/spack,mfherbst/spack,mfherbst/spack,mfherbst/spack,matthiasdiener/spack,LLNL/spack,matthiasdiener/spack,mfherbst/spack,LLNL/spack