reimplemented custom version of get_max_iso_packet_size, which works for usb 3 endpoints; this allows to switch from the forked libusb version of @JoshBlake to the latest official libusb version;
changed libusbx dependency to libusb
removed early exit from install_deps.sh
Merge pull request #30 from christiankerl/fix_max_iso_packet_size

reimplement custom version of libusb_get_max_iso_packet_size