[source] libubox: bump to git HEAD version

[LEDE Commits]

dedeckeh pushed a commit to source.git, branch master:
https://git.lede-project.org/470b13975de9a3dd5a97094074ac69ee58bc1431

commit 470b13975de9a3dd5a97094074ac69ee58bc1431
Author: Hans Dedecker <dedeckeh at gmail.com>
AuthorDate: Tue Oct 3 13:31:37 2017 +0200

    libubox: bump to git HEAD version
    
    632688e utils: nuke bitfield functions and macros
    f714be1 uloop: make SIGCHLD signal handling optional
    
    Signed-off-by: Hans Dedecker <dedeckeh at gmail.com>
---
 package/libs/libubox/Makefile | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/package/libs/libubox/Makefile b/package/libs/libubox/Makefile
index be8d921..5fdf946 100644
--- a/package/libs/libubox/Makefile
+++ b/package/libs/libubox/Makefile
@@ -5,9 +5,9 @@ PKG_RELEASE=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(LEDE_GIT)/project/libubox.git
-PKG_SOURCE_DATE:=2017-09-12
-PKG_SOURCE_VERSION:=7a1057604ed2ad83434ed3be03728065b14a5e9c
-PKG_MIRROR_HASH:=9040b13684de4343e86190d52c4f1a39e9ccee4b62b8c96075c1764280ce5a29
+PKG_SOURCE_DATE:=2017-09-29
+PKG_SOURCE_VERSION:=632688e8d6cde32781e4ec685d59afb0938300ad
+PKG_MIRROR_HASH:=84b5a0bc404e96a2965cadc1beb92664f4c22cc878a0a624eecd4b6884b56625
 CMAKE_INSTALL:=1
 
 PKG_LICENSE:=ISC