usign: update to latest git HEAD

Signed-off-by: John Crispin <[email protected]>

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