Revert "Remove enableGnome2 property from JDK derivation"

This reverts commit 32838d386a.

jdk.nix

@@ -9,7 +9,10 @@
 if buildPlatform == hostPlatform
 then jdk21
 else
-  jdk21.overrideAttrs (old: {
+  (jdk21.override {
+    # libIDL does not compile in cross-compile scenarios.
+    enableGnome2 = false;
+  }).overrideAttrs (old: {
     # lol, nixpkgs can’t get pkgs right
     # AUTOCONF = "${autoconf}/bin/autoconf";
     nativeBuildInputs = old.nativeBuildInputs ++ [which zip];