Implement shutdown, as required by mirage-flow 4.0.0 (#512)
* stack-unix: add shutdown operation (required by mirage-flow 4.0.0)
* tcp: implement shutdown
* opam: require mirage-flow 4
* restrict to randomconv < 0.2.0
* windows github action: add main opam-repository
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Mar 26 14:48 +00:00