Use new GLEW interface instead.
Use function pointers loaded via GLEW instead of trying to manually play the 'system GL or mangled Mesa?' game. We're still building two versions of the code, which is silly, but doesn't really matter. git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@8023 18c085ea-50e0-402c-830e-de6fd14e8384
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