Config update of tcpdump

package/tcpdump/tcpdump.mk

@@ -26,6 +26,7 @@ tcpdump-source: $(DL_DIR)/$(TCPDUMP_SOURCE)
 $(TCPDUMP_DIR)/.unpacked: $(DL_DIR)/$(TCPDUMP_SOURCE)
 	$(TCPDUMP_CAT) $(DL_DIR)/$(TCPDUMP_SOURCE) | tar -C $(BUILD_DIR) $(TAR_OPTIONS) -
 	toolchain/patch-kernel.sh $(TCPDUMP_DIR) package/tcpdump tcpdump\*.patch
+	$(CONFIG_UPDATE) $(TCPDUMP_DIR)
 	touch $@
 
 $(TCPDUMP_DIR)/.configured: $(TCPDUMP_DIR)/.unpacked