[AD] Change needed (?) for 4.9 API

["Trent Gamblin" <trent@xxxxxxxxxx>]

This weekend I made 4.9 compile and run with Borland Turbo C++.
Well, mostly. There is a problem that for some reason doesn't reveal
itself when using MinGW or MSVC. According to MS:

"There should be at most one
IDirect3DDevice9::BeginScene/IDirect3DDevice9::EndScene pair between
any successive calls to present (either IDirect3DDevice9::Present or
IDirect3DSwapChain9::Present)."

What that means is that al_flip_display has to become
al_flip_displays, and flip them all at once. It's not ideal but I
can't think of another solution. Any thoughts? Is it ok by the other
graphics developers (milan, elias)?


Cheers,
Trent :{)>