[PATCH setup] Add --allow-test-versions

[David Allsopp via Cygwin-apps]

Attached adds -t/--allow-test-packages to Setup which controls the initial
state of the "Test" checkbox.

Motivation is to allow one CI cron job to be installing test versions of
packages, then we can help identify things like [1] before they're released.


David


[1] https://cygwin.com/pipermail/cygwin/2021-April/248300.html

0001-Add-allow-test-packages.patch
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