[3.12] gh-129539: Include sysexits.h before checking EX_OK (#129590) (#129609)

[3.13] gh-129539: Include sysexits.h before checking EX_OK (#129590)

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

(cherry picked from commit 65f3432ac32f92bc3d8b7b11103a56c5a70049c0)

Co-authored-by: Collin Funk <collin.funk1@gmail.com>