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std: implement `hostname` Resolves https://github.com/rust-lang/libs-team/issues/330 Tracking issue: https://github.com/rust-lang/rust/issues/135142 This is based on rust-lang/rust#135141, but I've reimplemented the UNIX version, which now: * uses `sysconf(_SC_HOST_NAME_MAX)` as an initial buffer length * returns `OutOfMemory` if the `Vec` allocation fails * retries the operation if it detects that the name returned by `gethostname` was truncated Additionally, as part of the rebase, I had to move some WinSock abstractions (initialisation and error access) to `sys::pal` so that they can be accessed from `sys::net::hostname`. CC ``@orowith2os`` (and thank you for your work!)