CORBA23 — Type codes cannot describe all unions

Summary: Fix this by stating that member_label returns an Any containing
a sequence of labels if a single member has more than label.

Add a typedef to the TypeCode pseudo-IDL:

typedef sequence<any> LabelSeq;

A sequence of this type would be contained in the Any returned by
member_label() if a member has multiple labels (this avoids changing the
signature of member_label()).

For the above union, the member_count() operation would return 2, not 5.

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