Experimental win32 builds

[Nathan]

As I told Indra on the Pyglet list, I created some experimental builds
for win32 today. The biggest change is that I installed libbz2 and
zlib and enabled them in all three builds. This ought to make
decoding a whole lot more formats work all by itself. I also found
the most recent releaseo of stable branchs of both Libav (a fork of
FFmpeg) and FFmpeg and got them compiled with bz2 and zlib as well.

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1) I enabled bzlib and zlib during compilation, but didn't change anything else:

https://github.com/downloads/AVbin/AVbin/avbin-win32-v9-enable-bz2-zlib.zip

2) I switched from a 1-year-old version of FFmpeg to Libav 0.6.3
(Libav is a fork of FFmpeg and uses different version numbers) AND
enabled bzlib and zlib:

https://github.com/downloads/AVbin/AVbin/avbin-win32-v9-trylibav0.6.3.zip

3) I switched from a 1-year-old version of FFmpeg to FFmpeg 0.7.8 AND
enabled bzlib and zlib:

https://github.com/downloads/AVbin/AVbin/avbin-win32-v9-tryffmpeg0.7.8.zip
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Also, as I said on the Pyglet list, I don't yet have a test
environment set up for win32, so I'm relying entirely on feedback for
the moment as to how these releases work (or don't).

~ Nathan