glib: Fix python handling (#6910)
glib: Fix python handling (#6910)

Newer versions of glib require python. Fix up the python sbangs the same
way we already fix up the perl ones.

Fixes #6899
matthiasdiener/spack,iulian787/spack,mfherbst/spack,krafczyk/spack,matthiasdiener/spack,mfherbst/spack,iulian787/spack,tmerrick1/spack,LLNL/spack,krafczyk/spack,mfherbst/spack,EmreAtes/spack,iulian787/spack,matthiasdiener/spack,krafczyk/spack,iulian787/spack,iulian787/spack,EmreAtes/spack,LLNL/spack,matthiasdiener/spack,matthiasdiener/spack,mfherbst/spack,krafczyk/spack,krafczyk/spack,EmreAtes/spack,LLNL/spack,EmreAtes/spack,tmerrick1/spack,LLNL/spack,EmreAtes/spack,tmerrick1/spack,tmerrick1/spack,LLNL/spack,tmerrick1/spack,mfherbst/spack