Adapt to package installed under GHC version wise dir

Do not check other GHC versions if the last path component is
the package itself.

  e.g. ".cabal/lib/<arch>-<os>-ghc-<version>/<package>"
Use configCompilerEx for Cabal-1.18.0 or later

configCompiler was deprecated.
hlint police
Bump version to v0.5.3.0