Oh, hell, thanks for pointing it out. I was pretty sure that libusb-compat is just a fancy name for the old libusb!
So it seems there's no original libusb 0.1 for Arch right now. This shouldn't be hard, though.

Just wondering, what exactly happens while using libusb 1.0 with Nokia devices? And is the Nokia flasher affected as well?

Used it all under Arch 3 or 4 times and I'm wondering, how much luck I've had.