Linux kernels before had devpath containing `usbN-portM`.
Newer kernels just use `port` symlink instead, which breaks our udev rules.
Changing glob from `*-port*` to `*port*` makes it work for both old and new kernels.
Closes issues #608, #609.
* No need to check for both __gnu_linux__ and __linux__, latter is enough.
* Require libusb 1.0.13 to build - this makes LIBUSB_API_VERSION always defined.
* Include `<libusb.h>` not `<libusb-1.0/libusb.h>` - this will always work
if `pkg-config` is detected. For backwards compatibility still try building
without `pkg-config` present, but it is much less reliable and will not work on Mac.
* Bump copyright year.
It turns out that we can allow udev access to any USB hub using DRIVER=="hub"
udev filter, this should make it easier for linux ditros to add proper udev rules.
This change adds more documentation to README, and also adds ready to use udev rule
that should work for any USB hub and any Linux kernel version.
