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Windows: Cache the pipe filesystem handle Updates the anonymous pipe handling based on feedback from @lhecker (see https://github.com/rust-lang/rust/pull/142517#discussion_r3065864262). This does two things: 1. Cache the handle to the pipe filesystem so we don't have to reopen it each time. 2. Use the `\Device\NamedPipe\` directly instead of the symlink to it.