libubox: update to latest git head, introduces jshn json_is_a() helper

SVN-Revision: 34732

package/libs/libubox/Makefile

@@ -1,15 +1,15 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libubox
-PKG_VERSION:=2012-12-16.2
+PKG_VERSION:=2012-12-17
 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:=079549666fb172e74869653dcaf7d26b738d94db
+PKG_SOURCE_VERSION:=0505bf5f424cb5ba607c06cd821c1593fd7a2bef
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
-PKG_MIRROR_MD5SUM:=276f6024b9d86c45ae8cc9a9a01ec92d
+PKG_MIRROR_MD5SUM:=0c2b9d5277eeb0bea0bd6dc76202ddab
 CMAKE_INSTALL:=1
 
 PKG_LICENSE:=GPLv2