[WireGuard] wg doesn't build on 4.7 kernels

[Bruno Wolff III]

On Wed, Jun 29, 2016 at 23:05:01 +0200,
  "Jason A. Donenfeld" <Jason at zx2c4.com> wrote:
>Yep yep I know, sorry. Sent the last email prematurely. Working on
>that as we speak, about to push a commit.

No worries. I'm hoping this saves me from having to figure out how to 
do an ipsec tunnel and works better than using an ssh tunnel. I've been 
warned it's not production, so a hiccup or two is not unexpected.
Thanks for doing this work.