Version 2.9 is based on QT5 (with a much better interface) and requires
additionally the dependencies `qtbase`, `qtdeclarative` and `qttools`.
Furthermore the `QT_PLUGIN_PATH` had to be altered, however the
`phonon-backend` contains versioned paths, so we provide the plugin path
that matches the QT version used to build this package.
See #33248
This will probably be mandatory soon, and is a step in the right
direction. Removes the deprecated meta.version, and move some meta
sections to the end of the file where I should have put them in
the first place.
