feat(Cabal): cpp-options apply only to .hs files

[zlonast]

cpp-options apply only to .hs files; GHC ignores -optP for non-Haskell
files (and since 9.10 this behavior is explicit/enforced)

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[zlonast]

it's typo from rebase

[philderbeast]

I tested cabal-install:exe:cabal from this pull request on crypton and it builds without the error of #11992.