RFR: 7903920: Support building jtreg on FreeBSD

[snake66]

On Sat, 14 Dec 2024 10:48:09 GMT, snake66 <duke at openjdk.org> wrote:

> On FreeBSD we need to use GNU gmake instead of the BSD make program.

This work is done on behalf of The FreeBSD Foundation. https://oca.opensource.oracle.com/api/v1/members/public?&search=FreeBSD

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PR Comment: https://git.openjdk.org/jtreg/pull/237#issuecomment-2543057988