ubox: update to git head

- fixes extroot tag file corruption with long uuids

SVN-Revision: 37623

package/system/ubox/Makefile

@@ -1,13 +1,13 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=ubox
-PKG_VERSION:=2013-07-26
+PKG_VERSION:=2013-07-31
 PKG_RELEASE=$(PKG_SOURCE_VERSION)
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=git://nbd.name/luci2/ubox.git
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
-PKG_SOURCE_VERSION:=75b17dab43c511d1cecc70c370e9f8283dfbf547
+PKG_SOURCE_VERSION:=21737b1ff2e0be28b68293c7ac198a8fe505cbc2
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 CMAKE_INSTALL:=1