6to4: Remove sourcerouting parameter registration

Commit 31214c38 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>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45940 3c298f89-4303-0410-b956-a3cf2f4a3e73

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" ] || {