6rd : remove 6rd tunnel delete workaround

Remove 6rd tunnel delete workaround in as the real issue
is now solved in netifd
(https://git.openwrt.org/?p=project/netifd.git;a=commit;h=8f82742ca4f47f459284f3a07323d04da72ea5f6)

Signed-off-by: Hans Dedecker <[email protected]>

package/network/ipv6/6rd/Makefile

@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=6rd
-PKG_RELEASE:=11
+PKG_RELEASE:=12
 PKG_LICENSE:=GPL-2.0
 
 include $(INCLUDE_DIR)/package.mk

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

@@ -82,8 +82,6 @@ proto_6rd_setup() {
 
 proto_6rd_teardown() {
 	local cfg="$1"
-	local link="6rd-$cfg"
-	ip link del $link
 }
 
 proto_6rd_init_config() {