to the SDL, 3dfx, and Xv/X11 drivers.

The big change here is that all of the display drivers are now
compiled into the libvo library. This allows us to change
backends at runtime. The mpeg2dec application defaults to x11,
but you select your output mode using -o [mga|3dfx|sdl|x11].
I also cleaned the configure script up a bit, so there may be
some build breakages.

Here's the status of the various video_out backends.

mga  - tested
sdl  - tested
x11  - 32bpp tested
3dfx - untested, but should work
xv   - untested, but should work
gatos - broken

Now lets see if a fresh cvs checkout actually compiles :)

cheers,
aaron