Bug 721: NEWT/X11 RandR 1.3 Support - Part 1 - Delegate RandR functionality to pluggable impl. for RandR 1.1 and 1.3 (todo)
Bug 718: Further restriction of Windows BITMAP PFD's - RGB888 and !alpha only

On Windows Vista machines, using alpha, i.e. RGB8888 failed to SetPixelFormat(..),
hence only allow RGB888.