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RTS: expose closure_sizeW_ (#25252)

Sylvain Henry requested to merge hsyl20/ghc:hsyl20/closure-size into master

C code using the closure_sizeW macro can't be linked with the RTS linker without this patch. It fails with:

ghc-9.11.20240911: Failed to lookup symbol: closure_sizeW_

closure_sizeW is used in cardano-prelude and the fix comes from haskell.nix. I've just added the test.

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