shaders/av1: release under MIT
dav1d people want this to be permissive so they can adapt it for documentation purposes. I have no problems releasing this specific file under a permissive license. Note that since both the header and source code heavily depend on the LGPLv2.1+ parts of libplacebo, this licensing change isn't terribly useful unless you're just interested in copying fragments of the glsl code or some of the C helper functions.
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