Remove most msys special processing in TAP tests

Andrew Dunstan <andrew@dunslane.net>

Commit: 1c6d4629394d1b696b4e47ab4c501752e8c974e7
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2022-02-20T16:51:45Z
Releases: 15.0
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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