Add snb_ru_init(internal) to list of stub functions in tsearch2

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

Commit: f00d75b8d7a5e101b1a7434c282c17f7bb90aaa1
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2007-11-16T00:34:54Z
Releases: 8.3.0
Add snb_ru_init(internal) to list of stub functions in tsearch2
compatibility module.  Needed to support loading of 8.1-era tsearch2
configuration data.

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