RFR: 7903206: Support MSYS2 for building jtreg on Windows [v3]

[Jonathan Gibbons]

On Thu, 9 Jun 2022 10:44:42 GMT, Christian Stein <cstein at openjdk.org> wrote:

>> Support MSYS2 for building jtreg on Windows.
>
> Christian Stein has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Mix path to JDKHOME

Marked as reviewed by jjg (Lead).

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PR: https://git.openjdk.org/jtreg/pull/87