[WireGuard] OpenWRT package for wireguard

[Jason A. Donenfeld]

Hi Baptiste,

Cool! Looks very promising. Looking forward to seeing the performance
measures, and then optimizing WireGuard to improve whatever the
results happen to be.

One aspect that contributes to the size of the kernel module is that
it can't be stripped in the same way a userspace binary can, because
it has to be dynamically linked into the kernel.

Jason