tools/xz: update to 5.2.2

Update xz to version 5.2.2.
Add a secondary download location.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

SVN-Revision: 47298

tools/xz/Makefile

@@ -1,5 +1,5 @@
 # 
-# Copyright (C) 2006-2013 OpenWrt.org
+# Copyright (C) 2006-2015 OpenWrt.org
 #
 # This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.
@@ -7,11 +7,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=xz
-PKG_VERSION:=5.2.1
+PKG_VERSION:=5.2.2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
-PKG_SOURCE_URL:=http://tukaani.org/xz
-PKG_MD5SUM:=d484910b26fec5aff99ee66350589e29
+PKG_SOURCE_URL:=http://tukaani.org/xz \
+		http://fossies.org/linux/misc
+PKG_MD5SUM:=f90c9a0c8b259aee2234c4e0d7fd70af
 
 HOST_BUILD_PARALLEL:=1