RFR: 8367859: Remove nio exception gensrc

[Magnus Ihse Bursie]

On Thu, 18 Sep 2025 16:51:47 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> 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.

Alan is right, I just copied in the generated files. This is the files as generated by my previous PR. See this comment https://github.com/openjdk/jdk/pull/27338#issuecomment-3302348906 for details on how they differ. (Apart from a bug fix it is whitespace and comments only).

In addition to this, jcheck complained about the generated files containing tabs, so I also had to replace those with spaces. 

Please go ahead and modernize the code after this PR. :) (But how to do it "yesterday" eludes me ;-))

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PR Review Comment: https://git.openjdk.org/jdk/pull/27352#discussion_r2360419615