libubox: update to latest git HEAD

fix a bug the made uloop_end() not work when called from within a uloop_process
callback handler

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 44945

package/libs/libubox/Makefile

 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libubox
-PKG_VERSION:=2015-02-26.1
+PKG_VERSION:=2015-03-22
 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:=2a9edb464215d17c61fdaa6fbd97c99f1f130812
+PKG_SOURCE_VERSION:=b8d9b382e39823850331edc2a92379173daf1be3
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 PKG_MIRROR_MD5SUM:=
 CMAKE_INSTALL:=1