player/audio: mark some libaf interfacing parts as GPL only

"anders" has not agreed to relicense most of his changes (although he
gave permission for 4943e9c52c and 242aa6ebd4).

Note that commit 3053a8b7f is in part also affected. The commit message
hides this, but it seems some code was based on anders':

http://mplayerhq.hu/pipermail/mplayer-dev-eng/2002-October/011773.html

Much of the final commit was by Arpi, but it's still grating that there
was no proper attribution (and in a case that turned out to be so
important).

This means player/audio.c won't even compile (and other parts of the
player also use audio/audio.h, which is still GPL). But whether the end
result compiles doesn't matter for copyright.

Due to the heavy refactoring applied over the year, the boundaries are
rather fuzzy and also somewhat arbitrary, though.

Most of this code will have to be replaced with a new filter chain
later.

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