The implementation of libusb is not complete, and the missing functions
can lead to crashes. At least stub out this one, which is enough to get
the picolcd working.
* We have a merge request pending on libusb side. until then, we'll use
akshay's github repo.
* While this builds fine outside of Haikuporter, I had trouble with
getting it to run inside it. I'm not sure what's causing this. I got it
to build wth some minor tweaks to the makefile, anyway.
