libubox: update to latest version, adds some helper function

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

SVN-Revision: 36907

package/libs/libubox/Makefile

 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libubox
-PKG_VERSION:=2013-05-31
+PKG_VERSION:=2013-06-10
 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:=2851ce7edb3247233b0d07e6d26d5a2ed0478a56
+PKG_SOURCE_VERSION:=e5032709b29eb42568c3937a533898728a15efa1
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 PKG_MIRROR_MD5SUM:=
 CMAKE_INSTALL:=1