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Fix broken STD build for ESP-IDF PRs rust-lang/rust#147162 and rust-lang/rust#146937 did [broke](https://github.com/esp-rs/esp-idf-sys/actions/runs/18151791720/job/51663969786) the STD build for `target_os = "espidf"` because that target [does not have neither a `gethostname`, not a `libc::_SC_HOST_NAME_MAX` by default](https://github.com/espressif/esp-idf/issues/14849). While there is a [3rd party component for this syscall](https://components.espressif.com/components/espressif/sock_utils/versions/0.2.2/readme) in the ESP-IDF component registry, I don't think we should use it, because it does not come with ESP-IDF by default. Therefore, the one-liner fix just re-routes ESP-IDF into the `unsupported` branch.