wireguard: bump to 20180202

wireguard: bump to 20180202

Bump to latest wireguard release snapshot:

2675814 version: bump snapshot
381d703 qemu: update base versions
c3fbd9d curve25519: break more things with more test cases
93fa0d9 curve25519: replace fiat64 with faster hacl64
6177bdd curve25519: replace hacl64 with fiat64
b9bf37d curve25519: verify that specialized basepoint implementations are correct
bd3f0d8 tools: dedup secret normalization
1f87434 chacha20poly1305: better buffer alignment
78959ed chacha20poly1305: use existing rol32 function
494cdea tools: fread doesn't change errno
ab89bdc device: let udev know what kind of device we are
62e8720 qemu: disable AVX-512 in userland
6342bf7 qemu: disable PIE for compilation
e23e451 contrib: keygen-html: share curve25519 implementation with kernel
6b28fa6 tools: share curve25519 implementations with kernel
c80cbfa poly1305: add poly-specific self-tests
10a2edf curve25519-fiat32: uninline certain functions

No patch refresh required.

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

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