[racket] Detecting OpenGL support

From: Diogo F. S. Ramos (diogofsr at gmail.com)
Date: Wed Jul 31 00:00:47 EDT 2013

How does Racket detect OpenGL support?

I can run the `glxgears' program but I can't run the sgl examples at
`collects/sgl/examples/'.  When I try them, I get a dialog with this
message: "There was an error initializing OpenGL. Maybe OpenGL is not
supported on the current platform."

I'm on Linux and Racket v5.3.5.

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