[racket] SGL Bindings

From: Sean Kanaley (skanaley at gmail.com)
Date: Tue Jun 18 10:28:29 EDT 2013

Thank you Jay and Stephan for the information.  So the OpenGL package is 
not the same thing as what you get with (require sgl/gl), which in turn 
is the unwrapped (require sgl)?  And the OpenGL package is the "good" one?

I don't mind the matrix stuff, I just want to avoid strange type errors...

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