The jQuery v1.11.0 shows exactly the same behaviour here as well. At the same time previous version 1.10.2 works fine in IDE (no warnings).
I think it has something to do with "AMD-fy jQuery source" ticket (http://bugs.jquery.com/ticket/14113) -- looks like IDE has some issues figuring out this style.
If you wish (and can) -- roll back to jQuery v1.10.2 (which is like half a year old, which means it's stable and still good to use).
Hopefully IDE will be able to properly parse this new jQuery style in next release.
Just copy the uncompressed version of jQuery into your project folder.
you don't even need to import it into your project, just copy it to javascript folder.