Config update in libpcap

package/libpcap/libpcap.mk

@@ -35,6 +35,7 @@ libpcap-source: $(DL_DIR)/$(LIBPCAP_SOURCE)
 $(LIBPCAP_DIR)/.unpacked: $(DL_DIR)/$(LIBPCAP_SOURCE)
 	$(LIBPCAP_CAT) $(DL_DIR)/$(LIBPCAP_SOURCE) | tar -C $(BUILD_DIR) $(TAR_OPTIONS) -
 	toolchain/patch-kernel.sh $(LIBPCAP_DIR) package/libpcap/ \*.patch
+	$(CONFIG_UPDATE) $(LIBPCAP_DIR)
 	touch $@
 
 $(LIBPCAP_DIR)/.configured: $(LIBPCAP_DIR)/.unpacked