vo_opengl_cb: always setup/break vertex array bindings

Originally, this code was written to have full control over the OpenGL
state, rather than having to cooperate with unknown components by being
embeded like vo_opengl_cb is meant to be. As a consequence, it was
thought to be ok to setup a global binding (if the context is below
OpenGL 3.0, which guarantees VAOs).

This could break badly. Fix it by setting up and breaking the bindings
on entry/exit.

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