libreoffice: hide rhino behind withJava option

This should not meaningfully change the build without Java,
but it prevents eval from complaining about nonSource packages
related to rhino.

pkgs/applications/office/libreoffice/default.nix

@@ -617,9 +617,6 @@ stdenv.mkDerivation (finalAttrs: {
     # cannot find headers, no idea why
     "--without-system-boost"
 
-    "--with-system-rhino"
-    "--with-rhino-jar=${rhino}/share/java/js.jar"
-
     "--without-system-java-websocket"
   ]
   ++ optionals kdeIntegration [
@@ -627,6 +624,9 @@ stdenv.mkDerivation (finalAttrs: {
     "--enable-qt6"
   ]
   ++ optionals withJava [
+    "--with-system-rhino"
+    "--with-rhino-jar=${rhino}/share/java/js.jar"
+
     "--with-system-beanshell"
     "--with-ant-home=${ant.home}"
     "--with-beanshell-jar=${bsh}"