Make this work again with gtk4 prior to 4.10

Author: rhx

Sources/Gtk/FileDialog.swift renamed to Sources/Gtk/Gtk-4.0-4.10.cat

@@ -4,11 +4,11 @@
 //  Created by Rene Hexel on 24/1/2024.
 //  Copyright © 2024 Rene Hexel.  All rights reserved.
 //
-import CGtk
-import GtkCHelpers
-import GLib
-import GLibObject
-import GIO
+// import CGtk
+// import GtkCHelpers
+// import GLib
+// import GLibObject
+// import GIO
 
 public extension FileDialogProtocol {
     /// Open the file dialog.