[AD] Windows Variables patch

["John Harger" <john_h@xxxxxxxxxx>]

Okay, this doesn't really do anything for Allegro itself, but it does
help writing external drivers (such as AllegroGL, and one I'm working
on now to make Direct3D 7 setup easy)

It basically takes all of the global variables that were in
src/win/wddraw.h, and puts them in allegro/aintwin.h so they can be
exported and used outside of Allegro. I know at least one of these is
really important for windowed mode applications (wnd_windowed) because
without it set, the mouse driver won't acknowledge the window
boundaries. Anyway, it'd be a big help to be in there, and I've
compiled it, ran the test program and some examples, and it doesn't
seem to hurt anything.

-John

Attachment: patch-allegrocvs-windows_vars
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