Skip some permissions checks on Cygwin

Andrew Dunstan <andrew@dunslane.net>

Commit: f83908798f78c4cafda217ca875602c88ea2ae28
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2024-06-13T11:38:48Z
Releases: 17.0
Skip some permissions checks on Cygwin

These are checks that are already skipped on other Windows systems.

Backpatch to all live branches, as appropriate.

Files