gi: suppress a warning

    rb-gi-argument.c: In function ‘rb_gi_return_argument_free_container’:
    rb-gi-argument.c:684:50: warning: unused parameter ‘argument’ [-Wunused-parameter]
     rb_gi_return_argument_free_container(GIArgument *argument,
                                                      ^
gi: fix index
gi: support inout array
clutter: follow inout array change