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cabal: allow building under MacPorts again (#21940)
The recently released haskell tar-0.6 introduces some breaking changes that prevent Cabal from building on MacPorts because of its previous use of `--allow-newer` in `build.target`. This line was deliberately added (haskell/cabal#8360 (comment)), but it's causes persistent build failure.
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so previously haskell/cabal#8360 “-allow-newer” was required to build cabal, and now it breaks the build.
Don’t need to point out then this is fragile, and likely to break again and need to be re-added at some future time.