haskellPackages.text-icu: disable homebrew flag on darwin

By default text-icu sets homebrew=true. This can cause a nix build
of text-icu to accidentally link the homebrew icu. It can also
cause "doesn't work on my machine" issues when an old homebrew version
with icu is installed on a mac and is accidentally picked up.

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

@@ -391,6 +391,10 @@ self: super:
       '';
     }) super.rio;
 
+    # Don't use homebrew icu on macOS
+    # https://github.com/NixOS/nixpkgs/issues/462046
+    text-icu = disableCabalFlag "homebrew" super.text-icu;
+
     # https://github.com/haskell-crypto/cryptonite/issues/360
     cryptonite = appendPatch ./patches/cryptonite-remove-argon2.patch super.cryptonite;