rpm: Replace templates inside postinstall and postremove scripts
rpm: Replace templates inside postinstall and postremove scripts

This allows to use i.e. '%(files)s' inside postinstall or postremove
scripts to get the list of files in the package instead of hardcoding them

fluendo/cerbero,fluendo/cerbero,fluendo/cerbero,fluendo/cerbero,fluendo/cerbero