Applied patch to not crash on 3.2+ core profiles #17
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https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=727175
Most SOIL functions crash if OpenGL context is 3.2+ core profile. SOIL calls
glGetString with a value that is no longer valid, and then sends the returned
null pointer to strstr.
This patch checks the OpenGL version at runtime, and uses a glGetString function
that is appropriate and available. It doesn't crash if, for whatever reason,
glGetString returns a null pointer.