* gnu/packages/haskell.scm (ghc-hslua): Update to 0.9.5. [inputs]: Update lua-5.1 to lua; add ghc-exceptions, ghc-fail, and ghc-mtl. [native-inputs]: Remove ghc-hspec, ghc-hspec-contrib, hspec-discover, and ghc-hunit; add ghc-tasty, ghc-tasty-expected-failure, ghc-tasty-hunit, and ghc-tasty-quickcheck.