wireguard: bump to snapshot 20171127

wireguard: bump to snapshot 20171127

== Changes ==

 * compat: support timespec64 on old kernels
 * compat: support AVX512BW+VL by lying
 * compat: fix typo and ranges
 * compat: support 4.15's netlink and barrier changes
 * poly1305-avx512: requires AVX512F+VL+BW

 Numerous compat fixes which should keep us supporting 3.10-4.15-rc1.

 * blake2s: AVX512F+VL implementation
 * blake2s: tweak avx512 code
 * blake2s: hmac space optimization

 Another terrific submission from Samuel Neves: we now have an implementation
 of Blake2s using AVX512, which is extremely fast.

 * allowedips: optimize
 * allowedips: simplify
 * chacha20: directly assign constant and initial state

 Small performance tweaks.

 * tools: fix removing preshared keys
 * qemu: use netfilter.org https site
 * qemu: take shared lock for untarring

 Small bug fixes.

Remove myself from the maintainers list: we have enough and I'm happy to
carry on doing package bumps on ad-hoc basis without the 'official'
title.

Run-tested: ar71xx Archer C7 v2

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