_list_properties works, need one for enums

[Erik Walthinsen <omega temple-baptist com>]

FYI,

I've successfully added the use of g_object_class_list_properties to
GStreamer, including the ->gtkobject shim, but now notice the lack of a
similar call for enums, equivalent to gtk_type_enum_get_values.

      Erik Walthinsen <omega temple-baptist com> - System Administrator
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