Setting UIP_CONF_IPV6 to zero from the make build command line is
something that seems like it should ensure that IPv6 is disabled, but in
fact it actually *enables* IPv6. This seems counter intuitive, so this
patch changes the behavior of the makefiles to handle this case
properly.
This is based on a usb-test example by Philippe Retornaz. It has
been moved to platform and modified accordingly. With this in place:
- putchar() can work over USB. So we can use things like
printf, slip output
- USB input can be redirected to slip or serial input
The example itself is no longer needed in the source tree
See Pull Request #18
