Function gio_sys::g_output_stream_splice_async

pub unsafe extern "C" fn g_output_stream_splice_async(
    stream: *mut GOutputStream, 
    source: *mut GInputStream, 
    flags: GOutputStreamSpliceFlags, 
    io_priority: c_int, 
    cancellable: *mut GCancellable, 
    callback: GAsyncReadyCallback, 
    user_data: gpointer
)