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games/openjazz: Import package

OpenJazz is a free, open-source version of the classic Jazz Jackrabbit
games.

OpenJazz can be compiled on a wide range of operating systems, including
Windows, macOS, GNU/Linux and *BSD. Also ports are available for some
homebrew platforms, for example Wii and PSP.

To play, you will need the files from one of the original games.