Wrong "Perhaps you need to add" hints
## Summary
cabal 3.5 and GHC 9.0.1 (I bet HEAD as well).
"Perhaps you need to add" hint is wrong in two ways: asks to add a dep that is already there or to add a dep that does not fix the compilation. This is in context of internal libraries.
## Steps to reproduce
Detailed steps here:
https://github.com/haskell/cabal/issues/5782#issuecomment-820987923
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