File fix-build.patch of Package xtables-addons

Index: xtables-addons-1.42/extensions/xt_ECHO.c
===================================================================
--- xtables-addons-1.42.orig/extensions/xt_ECHO.c
+++ xtables-addons-1.42/extensions/xt_ECHO.c
@@ -19,6 +19,7 @@
 #endif
 #include <net/ip.h>
 #include <net/ip6_route.h>
+#include <net/ip6_checksum.h>
 #include <net/route.h>
 #include "compat_xtables.h"