minitube: 2.4 -> 2.9
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