Add 9.8 builds

I can already compile Ormolu Live without head.hackage using relaxed bounds and an s-r-p for aeson. So I think it already might make sense now, but can of course hold off until 9.8.1 gets released.

pkgs/wasm32-wasi-cabal.nix

-{ callPackage, flavour, writeShellScriptBin, }:
+{ lib, callPackage, flavour, writeShellScriptBin, }:
 let
   cabal = callPackage ./cabal.nix { };
   wasm32-wasi-ghc = callPackage ./wasm32-wasi-ghc.nix { inherit flavour; };
-  init-cabal-config = if flavour == "9.6" then "" else ''cp ${../cabal.config} "$CABAL_DIR/config" && chmod u+w "$CABAL_DIR/config"'';
+  init-cabal-config =
+    lib.optionalString (!lib.elem flavour [ "9.6" "9.8" ]) ''
+      cp ${../cabal.config} "$CABAL_DIR/config"
+      chmod u+w "$CABAL_DIR/config"
+    '';
 in
 writeShellScriptBin "wasm32-wasi-cabal" ''
   export CABAL_DIR="''${CABAL_DIR:-$HOME/.ghc-wasm/.cabal}"