Source-file copyright and license notices, preserved verbatim.

===== src/sys/unix/selector/poll.rs (source SHA-256 6ecf10be74e130339e2ad94d5a1c8647e988f1bb75c7a723be6f2d14a6fe26df) =====
// This implementation is based on the one in the `polling` crate.
// Thanks to https://github.com/Kestrer for the original implementation!
// Permission to use this code has been granted by original author:
// https://github.com/tokio-rs/mio/pull/1602#issuecomment-1218441031
