RFR: 7903920: Support building jtreg on FreeBSD

[snake66]

On Wed, 29 Jan 2025 18:41:35 GMT, Jan Lahoda <jlahoda at openjdk.org> wrote:

>> On FreeBSD we need to use GNU gmake instead of the BSD make program.
>
> Although I am not really an expert, but since @magicus approved, looks sensible to me.

Thank you @lahodaj

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PR Comment: https://git.openjdk.org/jtreg/pull/237#issuecomment-2623743032