RFR: 8367859: Remove nio exception gensrc

[Alan Bateman]

On Thu, 18 Sep 2025 16:32:21 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> I assume Magnus is using the generated classes and I think best to not change anything else with this update. We can follow-up yesterday for "opportunities" to modernize.
>
> OK fair enough. I just noticed that the file was modified, ie.
> 
> // -- This file was mechanically generated: Do not edit! -- //
> 
> was removed, so.

Yes, I think that has to be removed.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27352#discussion_r2360284037