Add Haskell package: pointfree
haskell-docs: re-generate with cabal2nix
haskell-HaskellNet: re-generate with cabal2nix
haskell-hscope: re-generate with cabal2nix
haskell-pointful: re-generate with cabal2nix
haskell-pointfree: re-generate with cabal2nix
haskell-pure-cdb: re-generate with cabal2nix
haskell-text-icu: this package is broken on Darwin

See <https://github.com/bos/text-icu/issues/6>.
haskell-{pure-cdb,hscope}: pass 'null' instead of 'testSimple', which is broken

The fact that test-simple doesn't exist won't matter because we just don't
execute the test suites of these packages.