ubus: update to the latest version, fixes a segfault on message retry

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46199 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/system/ubus/Makefile

 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=ubus
-PKG_VERSION:=2015-06-18
+PKG_VERSION:=2015-07-06
 PKG_RELEASE=$(PKG_SOURCE_VERSION)
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=http://git.openwrt.org/project/ubus.git
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
-PKG_SOURCE_VERSION:=b2e629a4e915e68acba129a5e00480e255ebc164
+PKG_SOURCE_VERSION:=ab1bffddb3574d18d36f321dce81e7e170abb3d6
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 PKG_MIRROR_MD5SUM:=
 CMAKE_INSTALL:=1