Skip some permissions checks on Cygwin

Andrew Dunstan <andrew@dunslane.net>

Commit: 57625308f62da2d4f875478a39158a23e41a3dbe
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2024-06-13T12:07:20Z
Releases: 13.16
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