bug#28823: lxqt-common is deprecated

[Maxim Cournoyer]

Our lxqt-common package's source currently points to
https://github.com/lxde/lxqt-common/archive/0.9.1.tar.gz, which
redirects to
https://github.com/lxde/lxqt-common-deprecated--do-not-use-anymore-/archive/0.9.1.tar.gz.

Notice the "deprecated--do-not-use-anymore" in the URL.

This has the immediate effect of breaking the hash of the archive.

Looking at the deprecated repo, it is not clear what needs to be
done. Possibly the now deprecated lxqt-common has been broken up in
various per-component repositories.

Maxim