[SDL] Full screen mode in WinDIB mode

[Sam Lantinga]

> I recently upgraded SDL from 1.1.2 to 1.1.3

> when I run my program in WinDIB mode (no DX installed)
> I get this message:

> Couldn't set video mode: No video modes supported

> How can I force it to use windowed mode instead of displaying this error?
> Is there any flag to set?

Don't set the SDL_FULLSCREEN flag, or check and retry setting the video
mode without that flag.  If it still fails, it's a bug in SDL, so please
let me know.

See ya!
	-Sam Lantinga, Lead Programmer, Loki Entertainment Software