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

[Deve]

Hi,

After direct contact with the author, I corrected the information about 
author and license in this commit:

https://sourceforge.net/p/supertuxkart/code/16762/

Also note that source files (the .mod file and lossless .wav file) are 
available in our media repo:
https://sourceforge.net/p/supertuxkart/code/HEAD/tree/media/trunk/music/mods/

More information:
http://forum.freegamedev.net/viewtopic.php?f=17&t=6562
https://github.com/supertuxkart/stk-code/issues/2577

I hope that this should be enough to fix this issue.

Regards,
Deve