pkgs/games: Remove license and copying info

We already cover that by the main project so we don't need to go by two
different licenses.

I've asked @layus whether the license change would be okay for his
contributions and he agreed:

https://github.com/aszlig/nixgames/pull/1#issuecomment-174551671

Other than that I'm the only author of every other commit and I
obviously agree as well :-)

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

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