[jdk17u] RFR: 8276854: Windows GHA builds fail due to broken Cygwin

[Aleksey Shipilev]

On Tue, 16 Nov 2021 08:17:04 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Clean backport to fortify Windows GHA runs.
> 
> Additional testing:
>  - [x] GHA Windows builds are fine
>  - [x] GHA Windows tests are fine

Got the push approval.

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PR: https://git.openjdk.java.net/jdk17u/pull/266