Bug#832062: supertuxkart: source for GPL song Boom_boom_boom.ogg missing

[Jacob's PC Tune-up]

 > The source of the .ogg file is missing.

The mod is actually in the media repo: 
https://svn.code.sf.net/p/supertuxkart/code/media/trunk/music/mods/Boom_boom_boom.mod

 > The license
of modarchive modules prohibits modification, so the file would be non-
free for Debian anyway (even if the "source" was included).

modarchive licensing should not be an issue, since it is in the media repo.