[vorbis] license change for squelch

[rik at kde.org]

I've changed the license for squelch to GPL. The reason I did this is so
that it matches the license of vorbis nicely.

There's a small web page up here:
http://www.geoid.clara.net/rik/squelch.html

.. where you can download the latest version, with a couple of bugfixes
and the license change.

Cheers,
Rik

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