syndrome2

I understand that on a well-tuned system, the success of a timing attack is doubtful, but why not increase the security for free? [compare_in_constant_time.patch.txt](https://github.com/Duncaen/OpenDoas/files/12091934/compare_in_constant_time.patch.txt) ``` diff '--color=auto' -ru a/shadow.c b/shadow.c...