vbo: don't call _glapi_set_dispatch for GL_COMPILE_AND_EXECUTE loopback

It uses Exec directly, so this didn't do anything.

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18828>
1 file changed