Remove most msys special processing in TAP tests

Andrew Dunstan <andrew@dunslane.net>

Commit: 2b02cadb5cbc4645adf0f8f7297d633e01258ee2
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2022-02-20T16:44:01Z
Releases: 10.21
Remove most msys special processing in TAP tests

Following migration of Windows buildfarm members running TAP tests to
use of ucrt64 perl for those tests, special processing for msys perl is
no longer necessary and so is removed.

Backpatch to release 10

Discussion: https://postgr.es/m/c65a8781-77ac-ea95-d185-6db291e1baeb@dunslane.net

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