pg_proc without oid?

I notice that this patch: 
http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_proc.h.diff?r1=1.443&r2=1.444

inserts a bunch of XML related rows in pg_proc without specifying oid.
This breaks the fmgrtab generator on msvc. Most likely because I didn't
think of that case. But since all other rows in pg_proc.h contain the
oid, I just wanted to check if they're actually supposed to be withuot
oid, or if that was a mistake?

//Magnus