Use upstream patch

radvd-werror.patch

@@ -1,5 +1,15 @@
+From 6e45acbf3d64b9bd945adcb3de622fd7d059ceb9 Mon Sep 17 00:00:00 2001
+From: Pavel Zhukov <pzhukov@redhat.com>
+Date: Fri, 6 Apr 2018 15:04:02 +0200
+Subject: [PATCH] Drop unused variable
+
+Compillation with Werror=all is now successfull.
+---
+ gram.y | 1 -
+ 1 file changed, 1 deletion(-)
+
 diff --git a/gram.y b/gram.y
-index 1c74c9d..b1d675c 100644
+index cc0dd4b..5db3bde 100644
 --- a/gram.y
 +++ b/gram.y
 @@ -408,7 +408,6 @@ v6addrlist_rasrcaddress	: IPV6ADDR ';'