gre6: Clean up unused struct ipv6_tel_txoption definition

Commit b05229f4 ("gre6: Cleanup GREv6 transmit path, call common GRE
functions") removed the ip6gre specific transmit function, but left the
struct ipv6_tel_txoption definition. Clean it up.
Signed-off-by: Jakub Sitnicki <jkbs@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/ip6_gre.c

@@ -484,11 +484,6 @@ static int gre_rcv(struct sk_buff *skb)
 	return 0;
 }
 
-struct ipv6_tel_txoption {
-	struct ipv6_txoptions ops;
-	__u8 dst_opt[8];
-};
-
 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
 {
 	return iptunnel_handle_offloads(skb,