Fix mspdebug libusb trackpad freezes when uploading

See details in issue #144
The fix is in libusb and the patches are posted here:
http://www.libusb.org/ticket/150
http://www.libusb.org/ticket/139
http://www.libusb.org/ticket/151
The discussion thread is here:
http://libusb.6.n5.nabble.com/DeviceNotifier-on-Mac-OSX-10-8-td5711425.html