Skip some permissions checks on Cygwin

Andrew Dunstan <andrew@dunslane.net>

Commit: 32c5dc0ebe83e927c953c42ad79148a03933c6ba
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2024-06-13T11:40:58Z
Releases: 16.4
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