Add an empty dhclient-script to keep dhclient from complaining

package/dhcp/dhclient-script

@@ -0,0 +1,2 @@
+#!/bin/sh
+# empty dhclient-script to keep dhclient from complaining

package/dhcp/dhcp.mk

@@ -55,6 +55,7 @@ $(TARGET_DIR)/$(DHCP_CLIENT_TARGET_BINARY): $(DHCP_DIR)/$(DHCP_RELAY_BINARY)
 	(cd $(TARGET_DIR)/var/lib; ln -snf /tmp dhcp)
 	$(INSTALL) -m 0755 -D $(DHCP_DIR)/$(DHCP_CLIENT_BINARY) $(TARGET_DIR)/$(DHCP_CLIENT_TARGET_BINARY)
 	$(INSTALL) -m 0644 -D package/dhcp/dhclient.conf $(TARGET_DIR)/etc/dhcp/dhclient.conf
+	$(INSTALL) -m 0755 -D package/dhcp/dhclient-script $(TARGET_DIR)/sbin/dhclient-script
 	rm -rf $(TARGET_DIR)/share/locale $(TARGET_DIR)/usr/info \
 		$(TARGET_DIR)/usr/man $(TARGET_DIR)/usr/share/doc