Query wrong GtkAccelLabel property type.

[Jeff Franks <jcf tpg com au>]

Hi,

Is the GtkAccelLabel "accel_closure" property installation wrong.
GClosure is a boxed type but the g_object_class_install_property()
function calls:

g_param_spec_object

instead of

g_param_spec_boxed.

and the GtkAccelLabel property getter and setter functions call
g_value_get_boxed and g_value_set_boxed.

Jeff.