[source] usign: update to latest git HEAD

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/?p=source.git;a=commitdiff;h=cbf6bc296f3cf8450b2864aef9f292674aa756fd

commit cbf6bc296f3cf8450b2864aef9f292674aa756fd
Author: John Crispin <john at phrozen.org>
AuthorDate: Mon Jul 4 16:36:47 2016 +0200

    usign: update to latest git HEAD
    
    Signed-off-by: John Crispin <john at phrozen.org>
---
 package/system/usign/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/package/system/usign/Makefile b/package/system/usign/Makefile
index 77db61f..e9eb84e 100644
--- a/package/system/usign/Makefile
+++ b/package/system/usign/Makefile
@@ -1,13 +1,13 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=usign
-PKG_VERSION:=2015-05-08
+PKG_VERSION:=2015-07-04
 PKG_RELEASE=$(PKG_SOURCE_VERSION)
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(LEDE_GIT)/project/usign.git
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
-PKG_SOURCE_VERSION:=cf8dcdb8a4e874c77f3e9a8e9b643e8c17b19131
+PKG_SOURCE_VERSION:=ef6419142a3b0fbcddcccf536e3c1880302c6f89
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 CMAKE_INSTALL:=1
 PKG_CHECK_FORMAT_SECURITY:=1