Integrated: Make method handle accessor private

[Maurizio Cimadamore]

On Fri, 19 Jan 2024 16:51:02 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> In my previous PR, I forgot to also make the method handle accessor (for native downcalls) `private`.
> 
> This was discovered when manually eyeballing at jextracted code for windows.h.

This pull request has now been integrated.

Changeset: 14f12739
Author:    Maurizio Cimadamore <mcimadamore at openjdk.org>
URL:       https://git.openjdk.org/jextract/commit/14f12739f59750340233870574c19d2dffd538db
Stats:     14 lines in 1 file changed: 0 ins; 12 del; 2 mod

Make method handle accessor private

Reviewed-by: jvernee

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PR: https://git.openjdk.org/jextract/pull/188