wireguard: bump version to 0.0.20180524

Contains a number of fixes, including fixes for building with GCC 8.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit f6b9d59f61b9084b1ae09e26e4bac5d6a1729cf6)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/wireguard/wireguard.hash

@@ -1,4 +1,4 @@
-# From https://lists.zx2c4.com/pipermail/wireguard/2018-April/002697.html
-sha256 b58cd2acf9e8d3fe9044c06c0056bd74da1f5673a456f011d36eee3f6fb1da16  WireGuard-0.0.20180420.tar.xz
+# From https://lists.zx2c4.com/pipermail/wireguard/2018-May/002914.html
+sha256 57614239c1f1a99a367f2c816153acda5bffada66a3b8e3b8215f1625784abc9  WireGuard-0.0.20180524.tar.xz
 # Locally calculated
 sha256 8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643  COPYING

package/wireguard/wireguard.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-WIREGUARD_VERSION = 0.0.20180420
+WIREGUARD_VERSION = 0.0.20180524
 WIREGUARD_SITE = https://git.zx2c4.com/WireGuard/snapshot
 WIREGUARD_SOURCE = WireGuard-$(WIREGUARD_VERSION).tar.xz
 WIREGUARD_LICENSE = GPL-2.0