Update oidjoins regression test for 9.6.

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

Commit: 63ae052367c350935c3cec3e3c53a1e34a317e96
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-06-22T21:12:55Z
Releases: 9.6.0
Update oidjoins regression test for 9.6.

Looks like we had some more catalog drift recently.

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