Build: use gtk-mac-integration only when creating bundle
Gtk-mac-integration was used only when creating the bundle, So there's no need to drag it as a dependency just because the build occurs on a macOS with a Gtk installation with Quartz backend.
Gtk-mac-integration was used only when creating the bundle, So there's no need to drag it as a dependency just because the build occurs on a macOS with a Gtk installation with Quartz backend.