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

[Per Minborg]

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

src/jdk.security.auth/share/classes/com/sun/security/auth/module/UnixSystem.java line 88:

> 86:             = (ValueLayout) LINKER.canonicalLayouts().get("size_t");
> 87: 
> 88:     private static final StructLayout capturedStateLayout = Linker.Option.captureStateLayout();

Would it be a good idea to use capitalized names for immutable static fields in all places in the class? E.g., `CAPTURED_STATE_LAYOUT` here.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28931#discussion_r2667524583