Fix foreign keys on system columns.

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

Commit: 01b73d3f27109e698724606764a8f7ec046952ed
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2001-10-23T17:39:03Z
Releases: 7.2.1
Fix foreign keys on system columns.

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