Standardize order of use strict and use warnings in Perl code

Peter Eisentraut <peter@eisentraut.org>

Commit: 80fc96eceb817d89cdd11c02c8ab913c8d060a3e
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2020-09-21T15:04:36Z
Releases: 14.0
Standardize order of use strict and use warnings in Perl code

The standard order in PostgreSQL and other code is use strict first,
but some code was uselessly inconsistent about this.

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