wireguard: bump to 0.0.20200105

wireguard: bump to 0.0.20200105

* socket: mark skbs as not on list when receiving via gro

Certain drivers will pass gro skbs to udp, at which point the udp driver
simply iterates through them and passes them off to encap_rcv, which is
where we pick up. At the moment, we're not attempting to coalesce these
into bundles, but we also don't want to wind up having cascaded lists of
skbs treated separately. The right behavior here, then, is to just mark
each incoming one as not on a list. This can be seen in practice, for
example, with Qualcomm's rmnet_perf driver. This lead to crashes on
OnePlus devices and possibly other Qualcomm 4.14 devices. But I fear
that it could lead to issues on other drivers on weird OpenWRT routers.

This commit is upstream in net-next as:
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=736775d06bac60d7a353e405398b48b2bd8b1e54

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>