ipv6: Export ipv6 functions for use by other protocols

For implementing other protocols on top of IPv6, such as L2TPv3's IP
encapsulation over ipv6, we'd like to call some IPv6 functions which
are not currently exported. This patch exports them.

Signed-off-by: Chris Elston <celston@katalix.com>
Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/ip6_flowlabel.c

@@ -294,6 +294,7 @@ struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
 	opt_space->opt_flen = fopt->opt_flen;
 	return opt_space;
 }
+EXPORT_SYMBOL_GPL(fl6_merge_options);
 
 static unsigned long check_linger(unsigned long ttl)
 {