Reconcile nodes/*funcs.c with PostgreSQL 10 work.

Noah Misch <noah@leadboat.com>

Commit: 39ac55918fc31b9bf88185d28ebe7ddc58d01181
Author: Noah Misch <noah@leadboat.com>
Date: 2017-06-16T07:16:11Z
Releases: 10.0
Reconcile nodes/*funcs.c with PostgreSQL 10 work.

The _equalTableFunc() omission of coltypmods has semantic significance,
but I did not track down resulting user-visible bugs, if any.  The other
changes are cosmetic only, affecting order.  catversion bump due to
readfuncs.c field order change.

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