Function cairo_sys::cairo_scaled_font_set_user_data

pub unsafe extern "C" fn cairo_scaled_font_set_user_data(
    scaled_font: *mut cairo_scaled_font_t, 
    key: *const cairo_user_data_key_t, 
    user_data: *mut c_void, 
    destroy: cairo_destroy_func_t
) -> cairo_status_t