cabal check will fail on -fprof-auto passed as a ghc-option

[cheecheeo]

This is consistent with the the current -auto-all behavior.

This fixes #2479.

Setup:

  % grep -- '-fprof-auto' stats.cabal
    ghc-prof-options: -Wall -fprof-auto -caf-all -threaded "-with-rtsopts=-p"

Before:

  % ../cabal/cabal-install/.cabal-sandbox/bin/cabal check
  No errors or warnings could be found in the package.

After:

  % ../cabal/cabal-install/.cabal-sandbox/bin/cabal check
  These warnings may cause trouble when distributing the package:
  * 'ghc-prof-options: -fprof-auto' is fine during development, but not
  recommended in a distributed package.

[23Skidoo]

Merged, thanks!