upgrade to 3.13.1

Signed-off-by: Imre Kaloz <kaloz@openwrt.org>

SVN-Revision: 39525

target/linux/x86_64/Makefile

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2013 OpenWrt.org
+# Copyright (C) 2013-2014 OpenWrt.org
 #
 # This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.
@@ -12,7 +12,7 @@ BOARDNAME:=x86_64
 FEATURES:=ext4 vdi vmdk targz
 MAINTAINER:=Imre Kaloz <kaloz@openwrt.org>
 
-LINUX_VERSION:=3.10.28
+LINUX_VERSION:=3.13.1
 
 KERNELNAME:=bzImage