haskell: add support for 'hardeningDisable' to the generic builder

We also have a new helper function 'disableHardening' to use in
overrides. Fixes https://github.com/NixOS/nixpkgs/issues/14820.

pkgs/development/haskell-modules/lib.nix

@@ -62,6 +62,8 @@ rec {
   doHyperlinkSource = drv: overrideCabal drv (drv: { hyperlinkSource = true; });
   dontHyperlinkSource = drv: overrideCabal drv (drv: { hyperlinkSource = false; });
 
+  disableHardening = drv: flags: overrideCabal drv (drv: { hardeningDisable = flags; });
+
   sdistTarball = pkg: pkgs.lib.overrideDerivation pkg (drv: {
     name = "${drv.pname}-source-${drv.version}";
     buildPhase = "./Setup sdist";