libubox: update to latest version, fixes utf-8 corruption issues in blobmsg_json

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 36984

package/libs/libubox/Makefile

@@ -1,13 +1,13 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libubox
-PKG_VERSION:=2013-06-18
+PKG_VERSION:=2013-06-21
 PKG_RELEASE=$(PKG_SOURCE_VERSION)
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=git://nbd.name/luci2/libubox.git
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
-PKG_SOURCE_VERSION:=b9ebdbcc648274cc630b6349374f9fb21e53f396
+PKG_SOURCE_VERSION:=6f192a6fb04504e065c222be11a6e294229300fe
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 PKG_MIRROR_MD5SUM:=
 CMAKE_INSTALL:=1