ibus-engines.mozc: add desktop file for gnome-control-center (#313335)

gnome-control-center needs this file to open the mozc settings.
This solution was copied from ubuntu.

pkgs/tools/inputmethods/ibus-engines/ibus-mozc/default.nix

···
 
     unzip bazel-bin/unix/mozc.zip -x "tmp/*" -d /
 
+    # create a desktop file for gnome-control-center
+    # copied from ubuntu
+    mkdir -p $out/share/applications
+    cp ${./ibus-setup-mozc-jp.desktop} $out/share/applications/ibus-setup-mozc-jp.desktop
+    substituteInPlace $out/share/applications/ibus-setup-mozc-jp.desktop \
+      --replace-fail "@mozc@" "$out"
+
     runHook postInstall
   '';
 

pkgs/tools/inputmethods/ibus-engines/ibus-mozc/ibus-setup-mozc-jp.desktop

···
+[Desktop Entry]
+Name=Mozc Setup
+Exec=@mozc@/lib/mozc/mozc_tool --mode=config_dialog
+Type=Application
+StartupNotify=true
+NoDisplay=true
+X-Desktop-File-Install-Version=0.27