iproute2: update project URL

It seems project URL has been changed.

Signed-off-by: Yanase Yuki <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/21279
Signed-off-by: Robert Marko <[email protected]>

package/network/utils/iproute2/Makefile

@@ -28,7 +28,7 @@ include $(INCLUDE_DIR)/nls.mk
 define Package/iproute2/Default
   SECTION:=net
   CATEGORY:=Network
-  URL:=http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2
+  URL:=https://wiki.linuxfoundation.org/networking/iproute2
   SUBMENU:=Routing and Redirection
   MAINTAINER:=Russell Senior <[email protected]>
 endef