Function libdazzle_sys::dzl_preferences_add_custom

pub unsafe extern "C" fn dzl_preferences_add_custom(
    self_: *mut DzlPreferences,
    page_name: *const c_char,
    group_name: *const c_char,
    widget: *mut GtkWidget,
    keywords: *const c_char,
    priority: c_int
) -> c_uint