Fixed boolean logic typo at end of C loader.

Any OpenGL version where either version major or minor component of the
version number is zero would be handled incorrectly due to a very easy
mistake that is hard to run into if you don't test on with an OpenGL
version that's affected!

Thanks for finding the bug go to @rtmf
Merge pull request #15 from hdon/master

Fixed boolean logic typo at end of C loader.