Commit a4d75c86 added a new flag, tracking if the statement was
processed by transformStatsStmt(), but failed to add this flag to
nodes/*funcs.c.

Catversion bump, due to adding a flag to copy/equal/out functions.

Reported-by: Noah Misch
Discussion: https://postgr.es/m/ad7891d2-e90c-b446-9fe2-7419143847d7%40enterprisedb.com