[SDL] change Refresh rate how?

[Sam Lantinga]

> Hello,

> browsing the docs I didn't found anything that pointed me out.
> So how can I change/detect the refresh rate of my fullwindow screen?

SDL doesn't support it at the moment because most of the platforms SDL
runs on don't support querying or setting the video refresh rate.

It's on the list for the next generation SDL API though.

See ya,
	-Sam Lantinga, Software Engineer, Blizzard Entertainment