Add variant regression file to support BSDen that underflow to plus zero instead

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

Commit: ede8f4e311fc24b45abdaa856c5afeb8238da78b
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2004-11-17T17:25:32Z
Releases: 8.0.0
Add variant regression file to support BSDen that underflow to plus zero instead
of minus zero.  Per Andrew Dunstan.

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