[AD] [WIN] DirectSound sample looping bugfix

["Eric Botcazou" <ebotcazou@xxxxxxxxxx>]

Here's a patch that fixes the last "historical" bug of the Windows port: the
"DirectSound sample looping isn't right" bug. To see it, use digitest and
put two custom loop points then start playing in loop mode.

So I've added the custom loop points support to the DirectSound driver; but
as this driver uses the very basic built-in DirectSound mixer, the support
can't be directly implemented and needs to be put alongside the main
sampling code. Moreover, the driver doesn't support backward playing.

The patch brings some improvements to MOD players: for example, jgmod
now plays perfectly Gillius' stellar.s3m file, whereas it produced some
popping noises before.

I've also corrected some formatting issues in wdsound.c .

--
Eric Botcazou
ebotcazou@xxxxxxxxxx

Attachment: wdsound.zip
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