wireguard: bump to 20171122

wireguard: bump to 20171122

Bump to latest WireGuard snapshot release:

ed479fa (tag: 0.0.20171122) version: bump snapshot
efd9db0 chacha20poly1305: poly cleans up its own state
5700b61 poly1305-x86_64: unclobber %rbp
314c172 global: switch from timeval to timespec
9e4aa7a poly1305: import MIPS64 primitive from OpenSSL
7a5ce4e chacha20poly1305: import ARM primitives from OpenSSL
abad6ee chacha20poly1305: import x86_64 primitives from OpenSSL
6507a03 chacha20poly1305: add more test vectors, some of which are weird
6f136a3 compat: new kernels have netlink fixes
e4b3875 compat: stable finally backported fix
cc07250 qemu: use unprefixed strip when not cross-compiling
64f1a6d tools: tighten up strtoul parsing
c3a04fe device: uninitialize socket first in destruction
82e6e3b socket: only free socket after successful creation of new
df318d1 compat: fix compilation with PaX
d911cd9 curve25519-neon: compile in thumb mode
d355e57 compat: 3.16.50 got proper rt6_get_cookie
666ee61 qemu: update kernel
2420e18 allowedips: do not write out of bounds
185c324 selftest: allowedips: randomized test mutex update
3f6ed7e wg-quick: document localhost exception and v6 rule

Compile-tested-for: ar71xx
Run-tested-on: ar71xx Archer C7 v2

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>