2.33.2 bugfix release

* Include shell completion files in the release tarball.
* Improve current system automatic identification.
* Only try to identify the current system if a default package format is not already set.
* Visionaire games: Add explicit dependency on SDL2.
* AppImage archives: Add missing early requirements check.
* Arch Linux: Fix generation of WINE prefixes.
* Debian: Prevent a leak of forced gzip compression when going over .deb size limit.
* Debian: Display an explicit error when dpkg-deb version can not be found.