changes:
- package new usbutils.pc
- move binaries into /usr/{bin,sbin} as default. udev uses only
usb.ids instead of binaries
- remove DEFAULT_PREFERENCE
- symbolic link /usr/sbin/lsusb to /usr/bin, lsusb can be used by
non-root, inspired by Debian
- separate usb.ids to a new package usbutils-ids, for finer grained
control, inspired by pciutils, also usbutils RDEPENDS on
usbutils-ids
- don't rm ${S}/libusb any more, since usbutils now doesn't bundle
an included libusb
