iproute2: drop dead tipc disabling code

Since it's automatic via libmnl being present it's just dead code that's
not defined any longer, so remove it.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/iproute2/iproute2.mk

@@ -54,7 +54,6 @@ define IPROUTE2_CONFIGURE_CMDS
 	cd $(@D) && $(TARGET_CONFIGURE_OPTS) ./configure
 	$(IPROUTE2_DISABLE_ARPD)
 	$(IPROUTE2_WITH_IPTABLES)
-	$(IPROUTE2_DISABLE_TIPC)
 endef
 
 define IPROUTE2_BUILD_CMDS