Rollup merge of #134999 - Berrysoft:dev/new-cygwin-target, r=chenyukang,workingjubilee

Add cygwin target.

This PR simply adds cygwin target together with msys2 target, based on ````@ookiineko```` 's (the account has been deleted) [work](https://github.com/ookiineko-cygport/rust) on cygwin target. My full work is here: https://github.com/rust-lang/rust/compare/master...Berrysoft:rust:dev/cygwin

I have succeeded in building a new rustc for cygwin target, and eventually distributed a new version of [fish-shell](https://github.com/Berrysoft/fish-shell/releases) (rewritten by Rust) for MSYS2.

I will open a new PR to fix std if this PR is accepted.
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Jacob Pratt 2025-02-13 03:53:28 -05:00 committed by GitHub
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