haskellPackages: remove darwin override for with-utf8_1_1_0_0 (#406303)

Author: maralorn

pkgs/development/haskell-modules/configuration-darwin.nix

@@ -62,7 +62,6 @@ self: super:
 
     # issues finding libcharset.h without libiconv in buildInputs on darwin.
     with-utf8 = addExtraLibrary pkgs.libiconv super.with-utf8;
-    with-utf8_1_1_0_0 = addExtraLibrary pkgs.libiconv super.with-utf8_1_1_0_0;
 
     git-annex = overrideCabal (drv: {
       # We can't use testFlags since git-annex side steps the Cabal test mechanism