Doc: update testing recipe in src/test/perl/README.

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

Commit: 3eb1f4d09745433c70ccac411cad24d0374b9c3b
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2021-10-10T21:55:36Z
Releases: 15.0
Doc: update testing recipe in src/test/perl/README.

The previous text didn't provide any clear explanation of our policy
around TAP test portability.  The recipe for using perlbrew had some
problems, too: it resulted in a non-shared libperl (preventing
testing of plperl) and it caused some modules to be updated to
current when the point of the recipe is to build an old environment.

Discussion: https://postgr.es/m/E1mYY6Z-0006OL-QN@gemulon.postgresql.org

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src/test/perl/README modified +24 −8

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