Non-free copyrighted assets in packaged Luanti (Minetest) mods

[ROllerozxa]

Debian packages a number of Luanti mods with the prefix "minetest-mod-". A
lot of these are very old versions and may contain non-free copyrighted
assets that have been replaced with free replacements in the latest
version. I don't know if the packages are even being maintained but I'm
sending this as a notification to whoever maintains them.