PR: Load libGL using low-level function without requiring pyopengl #7029
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Fixes #6968.
Loading libGL at the very start fixes a segmentation fault on some Linux systems (including mine!). This uses a low-level function from cdll to load libGL instead of requiring and importing pyopengl which implicitly loads libGL (I guess). Thus, we also drop the pyopengl requirement.
See discussion at ContinuumIO/anaconda-issues#9199 (where @ccordoba12 approved this approach) and #3226.