libubox: update to latest git revision

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 46937

package/libs/libubox/Makefile

@@ -1,13 +1,13 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libubox
-PKG_VERSION:=2015-06-29
+PKG_VERSION:=2015-09-15
 PKG_RELEASE=$(PKG_SOURCE_VERSION)
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=http://git.openwrt.org/project/libubox.git
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
-PKG_SOURCE_VERSION:=32e49d687b6557a01a439a3e2a9eebdf638d4b03
+PKG_SOURCE_VERSION:=136a5196266d03d537f822c4e67d2fde2ed59505
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 PKG_MIRROR_MD5SUM:=
 CMAKE_INSTALL:=1