[AD] [WIN] DirectDraw2 support

["Eric Botcazou" <ebotcazou@xxxxxxxxxx>]

Here's a patch that upgrades the DirectDraw code to the DirectDraw2
interface (the one introduced with DirectX 3 ! Microsoft's consistency...)

Only one method was added (to retrieve the amount of available and free
video memory) but the display mode setting methods were changed to accept
the refresh rate as a parameter.

I've coded the refresh rate support, but I don't know whether it actually
works since my ATI driver seems not to allow DirectX to change it.

(a little program that enumerates all the available graphic modes on a
particular system, including the refresh rate, is located at
http://perso.libertysurf.fr/ebotcazou/ddraw2.zip)

--
Eric Botcazou
ebotcazou@xxxxxxxxxx

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