No need. I explicitely tell them that I don't care if they remember exact library/function names, and to just make them up and tell me what they do, if they don

No need. I explicitely tell them that I don't care if they remember exact library/function names, and to just make them up and tell me what they do, if they don't remember. If you require specifics like that, you'll filter out anyone who hasn't worked on that specific very recently. Those sorts of things aren't something you should need to worry about keeping in your head for long.