This may be obvious but then maybe not for everyone. Brew isn't giving you an _error_ it giving you a _warning_. Brew should issue a warning since as it says "If you didn't put them there on purpose they could cause problems". Only you did put that lib there on purpose when you installed DisplayLink and they're not causing problems... at least not that I've heard of so like so many _warnings_ in life, ignore it and move on.
While Brew would like to manage everything in /usr/local/lib, it's not it's exclusive domain.
Anyway, I use Brew too and while I'd love to see no _warnings_ unless there is a actual _error_, I don't think there really is anything to do here. It's all behaving exactly as it's designed to.
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