gh-129539: Include sysexits.h before checking EX_OK

[collinfunk]

Previously the macro would be redefined when the header was included.

• Issue: Check EX_OK is defined before including sysexits.h means it is always redefined #129539

[ghost]

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[ZeroIntensity]

Thanks! LGTM.

cc @vstinner as the person who wrote the code.

[vstinner]

Thanks, your change is correct. But I was fed up of such bugs so I wrote a big refactoring change to reduce the risk of such bug: #129558

Your change remains relevant for 3.13 branch. Can you try to create a new PR for 3.13? Thanks.

[bedevere-app]

GH-129590 is a backport of this pull request to the 3.13 branch.

[collinfunk]

Thanks, your change is correct. But I was fed up of such bugs so I wrote a big refactoring change to reduce the risk of such bug: #129558

Sounds good to me. Thanks!

Your change remains relevant for 3.13 branch. Can you try to create a new PR for 3.13? Thanks.

I created #129590. Not used to the Python pull request workflow so sorry in advance for any mistakes. :)

[bedevere-app]

GH-129590 is a backport of this pull request to the 3.13 branch.