Function nativeshell::shell::platform::flutter_sys::fl_binary_messenger_set_message_handler_on_channel

pub unsafe extern "C" fn fl_binary_messenger_set_message_handler_on_channel(
    messenger: *mut FlBinaryMessenger, 
    channel: *const c_char, 
    handler: FlBinaryMessengerMessageHandler, 
    user_data: gpointer, 
    destroy_notify: GDestroyNotify
)