Remove special outfuncs/readfuncs handling of RangeVar.catalogname.
Historically we skipped writing/reading this field, but that no
longer works under WRITE_READ_PARSE_PLAN_TREES since we expanded
the coverage of that option to include utility commands (
787102b56).
Remove the special case and just treat this field normally.
Bump catversion out of an abundance of caution --- I do not think
we currently ever store RangeVar nodes in the catalogs, but
perhaps I'm wrong.
Per report from Pavel Stehule.
Discussion: https://postgr.es/m/CAFj8pRAYvYu-qU7-NieqRRyaQZk-yr3UjtHQ2LR62PS9M1dZMA@mail.gmail.com