Further refinement of stuck_on_old_timeline recovery test

Andrew Dunstan <andrew@dunslane.net>

Commit: fb3d6b0e1aa41518857ff12534bef49503ce7575
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2021-06-15T19:36:59Z
Releases: 12.8
Further refinement of stuck_on_old_timeline recovery test

TestLib::perl2host can take a file argument as well as a directory
argument, so that code becomes substantially simpler. Also add comments
on why we're using forward slashes, and why we're setting
PERL_BADLANG=0.

Discussion: https://postgr.es/m/e9947bcd-20ee-027c-f0fe-01f736b7e345@dunslane.net

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