fix for array handling in ancient bash
fix for array handling in ancient bash

fixes #284

matthiasdiener/spack,skosukhin/spack,matthiasdiener/spack,skosukhin/spack,krafczyk/spack,krafczyk/spack,tmerrick1/spack,tmerrick1/spack,LLNL/spack,tmerrick1/spack,krafczyk/spack,lgarren/spack,tmerrick1/spack,LLNL/spack,skosukhin/spack,LLNL/spack,EmreAtes/spack,skosukhin/spack,iulian787/spack,EmreAtes/spack,EmreAtes/spack,iulian787/spack,TheTimmy/spack,mfherbst/spack,krafczyk/spack,TheTimmy/spack,matthiasdiener/spack,TheTimmy/spack,TheTimmy/spack,iulian787/spack,mfherbst/spack,LLNL/spack,skosukhin/spack,lgarren/spack,mfherbst/spack,lgarren/spack,krafczyk/spack,tmerrick1/spack,EmreAtes/spack,matthiasdiener/spack,lgarren/spack,matthiasdiener/spack,LLNL/spack,mfherbst/spack,iulian787/spack,mfherbst/spack,TheTimmy/spack,EmreAtes/spack,iulian787/spack,lgarren/spack