MFC cleanup of libusb20 example
r257779 by hselasky:
- Use libusb20_strerror() function instead of custom usb_error() one.
- Rename "aux.[ch]" to "util.[ch]" which is a more common name for
utility functions and allows checkout on some non-FreeBSD systems
where the "aux.*" namespace is reserved.
- Fix some compile warnings while at it.
r257796 by glebius:
Finish r257779.
PR: 183728
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