mesa: Stub out GL_APPLE_object_purgeable
There's slots in the glapi static dispatch table (which is still arguably ABI) which we need to preserve, but we can stop exposing the extension string or doing anything in the added functions.
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There's slots in the glapi static dispatch table (which is still arguably ABI) which we need to preserve, but we can stop exposing the extension string or doing anything in the added functions.