libubox: update to the latest version, adds a base64 implementation

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

SVN-Revision: 45641

package/libs/libubox/Makefile

@@ -1,13 +1,13 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libubox
-PKG_VERSION:=2015-03-22
+PKG_VERSION:=2015-05-08
 PKG_RELEASE=$(PKG_SOURCE_VERSION)
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=http://git.openwrt.org/project/libubox.git
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
-PKG_SOURCE_VERSION:=b8d9b382e39823850331edc2a92379173daf1be3
+PKG_SOURCE_VERSION:=a8e70c6d361967a23977417fb7d6cf56234f8b81
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 PKG_MIRROR_MD5SUM:=
 CMAKE_INSTALL:=1