wireguard: bump to version 0.0.20171221

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/wireguard/wireguard.hash

@@ -1,4 +1,4 @@
-# From https://lists.zx2c4.com/pipermail/wireguard/2017-December/002200.html
-sha256 57d799d35e92c905e548d00adeb7ed1ead4d6560f084c99e5aae0a87b4eb09e4  WireGuard-0.0.20171211.tar.xz
+# From https://lists.zx2c4.com/pipermail/wireguard/2017-December/002231.html
+sha256 2b97697e9b271ba8836a04120a287b824648124f21d5309170ec51c1f86ac5ed  WireGuard-0.0.20171221.tar.xz
 # Locally calculated
 sha256 8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643  COPYING

package/wireguard/wireguard.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-WIREGUARD_VERSION = 0.0.20171211
+WIREGUARD_VERSION = 0.0.20171221
 WIREGUARD_SITE = https://git.zx2c4.com/WireGuard/snapshot
 WIREGUARD_SOURCE = WireGuard-$(WIREGUARD_VERSION).tar.xz
 WIREGUARD_LICENSE = GPL-2.0