Fix for SPACK-50
Fix for SPACK-50

Bad format string in version check.

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