GtkRadioButtons: Mark group arguments as "allow-none"
In the current introspection data, the various gtk_radio_button_new_* constructors take an existing group or widget. These all allow passing a NULL widget or group list, so that it becomes easy to build a radio button list in a loop (pass in None the first time, and the previously created button in all other iterations). Add the missing "allow-none" tag to the introspection data, so that this will also eventually work for GIR users. NB that it does not actually work for some constructors yet (like new_with_label_from_widget()) due to https://bugzilla.gnome.org/show_bug.cgi?id=561264. https://bugzilla.gnome.org/show_bug.cgi?id=635253
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