runhaskell is missing on Windows

After installing GHC 9.0.1 via Chocolatey, it lacks runhaskell, but contains runghc. I also observe the same absence of runhaskell on GitHub CI actions (which might well be installing via Chocolatey, or a direct GHC install, I have no idea). I guess it's a problem with the upstream GHC distribution, but it could equally be a problem with the Chocolatey wrapping (I don't have time to investigate that).

It was present with GHC 8.10.3, which is otherwise the most recent GHC on my machine.

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