RFR: 7903515: Some default env vars on Windows not set [v2]

[Jonathan Gibbons]

On Thu, 10 Aug 2023 08:17:00 GMT, Christian Stein <cstein at openjdk.org> wrote:

>> Please review this change to fix setting of some default environment variables on Windows.
>
> Christian Stein has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove `CaseInsensitive` from method name

Marked as reviewed by jjg (Lead).

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PR Review: https://git.openjdk.org/jtreg/pull/166#pullrequestreview-1577244732