Suricata

Suricata codebase has some commented-out code that has been there sometimes for a long while.

Some examples:
https://github.com/OISF/suricata/blob/master/src/detect-filename.c#L362
https://github.com/OISF/suricata/blob/master/src/detect-engine.c#L1022

Would be good to clean those up in master, at least.
This is an exploratory task, as we're not providing the full list of files affected.