Update oidjoins regression test for 9.4.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: cbb5e23bfa92973bddf11935448a9d42c32f7d42
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2014-04-16T18:28:59Z
Releases: 9.4.0
Update oidjoins regression test for 9.4.

Now that we're pretty much feature-frozen, it's time to update the checks
on system catalog foreign-key references.

(It looks like we missed doing this altogether for 9.3.  Sigh.)

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