RFR: 8277489: Rewrite JAAS UnixLoginModule with FFM [v7]

[Anthony Scarpino]

On Mon, 5 Jan 2026 17:20:29 GMT, Weijun Wang <weijun at openjdk.org> wrote:

>> Rewrite the native calls with FFM.
>
> Weijun Wang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   must have username; more comments

Marked as reviewed by ascarpino (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28931#pullrequestreview-3645433959