visit package update, add glu as a linux dep (#17537)
visit package update, add glu as a linux dep (#17537)

* visit: add glu as a dep for linux

* add note to suggested install command about mesa
LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack,LLNL/spack,iulian787/spack,iulian787/spack,iulian787/spack,LLNL/spack