[AD] [WIN] Support for native windows

["Eric Botcazou" <ebotcazou@xxxxxxxxxx>]

While some are speedhacking, some other are doing real work... ;-)

This patch implements support for native windows under Win32: up to 4.0.x,
this was mostly working except... the graphics subsystem. The patch removes
the last restrictions so that the three windowed drivers work when Allegro
is attached to an external window (I've also added a patch against
dibsound.c that demonstrates the feature).

That was easier than I had thought :-) so I plan to spend the unexpected
free time coding a more demonstrative example.

--
Eric Botcazou
ebotcazou@xxxxxxxxxx

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