libubox: update to latest version, fixes some ustream issues that might be affecting uhttpd

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

SVN-Revision: 36803

package/libs/libubox/Makefile

@@ -1,13 +1,13 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libubox
-PKG_VERSION:=2013-05-29
+PKG_VERSION:=2013-05-31
 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:=54a0b49326904fc3281c72cd9d9f1fe950e39d05
+PKG_SOURCE_VERSION:=2851ce7edb3247233b0d07e6d26d5a2ed0478a56
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 PKG_MIRROR_MD5SUM:=
 CMAKE_INSTALL:=1