ubus: update to the latest version, fixes compile error regressions

Signed-off-by: Felix Fietkau <[email protected]>

SVN-Revision: 41496

package/system/ubus/Makefile

@@ -7,7 +7,7 @@ PKG_RELEASE=$(PKG_SOURCE_VERSION)
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=git://nbd.name/luci2/ubus.git
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
-PKG_SOURCE_VERSION:=af63ab64af10798468ca1453de2360fcda44aab9
+PKG_SOURCE_VERSION:=f688c7ad0b2435a89bfd13f5496cabf596b54c8f
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 PKG_MIRROR_MD5SUM:=
 CMAKE_INSTALL:=1