Remove most msys special processing in TAP tests

Andrew Dunstan <andrew@dunslane.net>

Commit: aa8d4137f990da6949a87cdea49907f3519f5849
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2022-02-20T16:50:17Z
Releases: 12.11
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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