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GLX: Allow different dispatch tables for different contexts.

Kyle Brenneman requested to merge github/fork/kbrenneman/libglx-per-context-dispatch into master

Created by: kbrenneman

This is an extension to the libGLX vendor library interface that allows a vendor to provide different dispatch tables for each GLXContext.

It adds two optional callbacks to the __GLXapiImports struct. The first allows the vendor to provide an opaque dispatch table handle for a GLXContext. The second callback is used to populate a dispatch table.

The goal is to allow a library such as Mesa to use libglvnd's dispatch layer instead of having to send every OpenGL function through two layers.

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