libusb: point alias to libusb1

Until recently, libusb-compat propagated libusb1 and many packages unknowingly used it to obtain libusb1.
When https://github.com/NixOS/nixpkgs/pull/82944 removed this evil propagation, it broke many packages with such incorrect assumption.
This patch trades the breakage of packages wanting libusb1 caused by the PR for a hopefully less common breakage of the packages relying on the compat library.