I have the same screw on my Accent. It's to hold the rotors on during factory assembly and serves no purpose once you bolt a wheel onto the car. Get it out using any means necessary, drill it if you have to, it doesn't matter. Other than that if you want to try to get it out I suggest you spray penetrating oil on it and let it sit for a while and try again with the screwdriver.
BTW, a little off topic but Craftsman makes some amazingly great screwdrivers that almost never strip a screw. I know, it seems like they would all be the same but I swear they're not.