6to4: Remove sourcerouting parameter registration

Commit 31214c38c8dd0f70366b523f9b0335145b9386bd removes IPv6 unneeded source-dest-routing workarounds;
as a result sourcerouting parameter is unused and can be removed.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

SVN-Revision: 45940

package/network/ipv6/6to4/files/6to4.sh

@@ -91,7 +91,6 @@ proto_6to4_init_config() {
 	proto_config_add_int "mtu"
 	proto_config_add_int "ttl"
 	proto_config_add_string "tos"
-	proto_config_add_boolean "sourcerouting"
 }
 
 [ -n "$INCLUDE_ONLY" ] || {