Fix PostgreSQL::Test aliasing for Perl v5.10.1.

Noah Misch <noah@leadboat.com>

Commit: bf92b73beb509f58f4338e31269495489a2ea610
Author: Noah Misch <noah@leadboat.com>
Date: 2022-06-25T21:16:00Z
Releases: 11.17
Fix PostgreSQL::Test aliasing for Perl v5.10.1.

This Perl segfaults if a declaration of the to-be-aliased package
precedes the aliasing itself.  Per buildfarm members lapwing and wrasse.
Like commit 20911775de4ab7ac3ecc68bd714cb3ed0fd68b6a, back-patch to v10
(all supported versions).

Discussion: https://postgr.es/m/20220625171533.GA2012493@rfd.leadboat.com

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