Update contrib for tsearch changes.

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

Commit: 8461ab5ab164cdcec9a294ca99133e3913926500
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2008-05-16T17:26:07Z
Releases: 8.4.0
Update contrib for tsearch changes.

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