glx: Fix GLX_CONTEXT_RELEASE_BEHAVIOR_ARB handling
None of this was getting compiled because we hadn't defined the macro (and aren't getting them from <GL/glxext.h> because reasons). Fix that.
Fixes: #684 (closed)
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None of this was getting compiled because we hadn't defined the macro (and aren't getting them from <GL/glxext.h> because reasons). Fix that.
Fixes: #684 (closed)