libubox: update to latest version, includes a small uloop fix

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

SVN-Revision: 37526

package/libs/libubox/Makefile

@@ -1,13 +1,13 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libubox
-PKG_VERSION:=2013-07-04
+PKG_VERSION:=2013-07-24
 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:=11e8afea0f7eb34f8c23a8e589ee659c46f3f8aa
+PKG_SOURCE_VERSION:=510e4956e58727d68fbf7dea1646a344d6901c91
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 PKG_MIRROR_MD5SUM:=
 CMAKE_INSTALL:=1