glx-destroycontext-3: Test calling DestroyContext redundantly
Cloned from -2. This fails in various ways at the moment and it's not clear what the spec really wants, but the XMesa-based fake GLXes will crash on this, which is definitely wrong.
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Cloned from -2. This fails in various ways at the moment and it's not clear what the spec really wants, but the XMesa-based fake GLXes will crash on this, which is definitely wrong.