stylish-cabal: fix the build

We can still compile the package with ghc-8.6.5. Later
compiler versions don't work, unfortunately.

pkgs/development/haskell-modules/hackage-packages.nix

@@ -107228,6 +107228,27 @@ self: {
        broken = true;
      }) {};
 
+  "haddock-library_1_7_0" = callPackage
+    ({ mkDerivation, base, base-compat, bytestring, containers, deepseq
+     , hspec, hspec-discover, parsec, QuickCheck, text, transformers
+     }:
+     mkDerivation {
+       pname = "haddock-library";
+       version = "1.7.0";
+       sha256 = "04fhcjk0pvsaqvsgp2w06cv2qvshq1xs1bwc157q4lmkgr57khp7";
+       libraryHaskellDepends = [
+         base bytestring containers parsec text transformers
+       ];
+       testHaskellDepends = [
+         base base-compat bytestring containers deepseq hspec parsec
+         QuickCheck text transformers
+       ];
+       testToolDepends = [ hspec-discover ];
+       description = "Library exposing some functionality of Haddock";
+       license = stdenv.lib.licenses.bsd3;
+       hydraPlatforms = stdenv.lib.platforms.none;
+     }) {};
+
   "haddock-library" = callPackage
     ({ mkDerivation, base, base-compat, bytestring, containers, deepseq
      , directory, filepath, hspec, hspec-discover, optparse-applicative
@@ -231440,7 +231461,8 @@ self: {
        doHaddock = false;
        description = "Format Cabal files";
        license = stdenv.lib.licenses.bsd3;
-       maintainers = with stdenv.lib.maintainers; [ peti ];
+       hydraPlatforms = stdenv.lib.platforms.none;
+       broken = true;
      }) {};
 
   "stylish-haskell" = callPackage