From: Marcus Sundberg <e94_msu@elixir.e.kth.se>
  To  : ggi-develop@eskimo.com
  Date: Fri, 14 Aug 1998 14:20:47 +0200

ASYNC SVGAlib wrapper

I've hacked up an ASYNC mode for the SVGAlib wrapper, which can
be enabled by setting the GGI_ASYNCSVGA environmentvariable.
It should increase performance for apps that run in <20fps
and give smooth animation for apps that does more than 20 fps.

ggiFlush() is called from mouse_update(), so it will probably
only be useful for apps that calls this function once per
frame...
I'll hack in the option to flush in vga_waitretrace() or
keyboard_update() instead.

//Marcus