Function simply_wayland::wl_data_device_start_drag

pub unsafe extern "C" fn wl_data_device_start_drag(
    wl_data_device: *mut wl_data_device, 
    source: *mut wl_data_source, 
    origin: *mut wl_surface, 
    icon: *mut wl_surface, 
    serial: u32
)