Auto merge of #3370 - RalfJung:windows-sync, r=RalfJung

windows: remove support for slim rwlock

Since https://github.com/rust-lang/rust/pull/121956 we don't need it any more, and we are generally short on Windows staff so reducing the amount of code we have to test and maintain sounds like a good idea.

The InitOnce stuff is still used by `thread_local_key::StaticKey` on 64bit windows-gnu.
This commit is contained in:
bors 2024-03-12 19:07:42 +00:00
commit a3b43b2bf4

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