Borked update of libubox causes procd crash but fixes security issue
OpenWrt updated in 19.07 libubox and introduced bug that can be invoked by using
procd_add_param pidfile in init file. This causes in some cases crash of procd.
Initially we fixed it by reverting it but it is required for security fix in ucert. We do not want to revert ucert as well but it fails to build otherwise.