[PATCH] fix unresolved syms for serial drivers

The following two patches seem to be needed to export the requisite
symbols needed for fully modular builds of the new serial drivers in
2.5.28.

drivers/char/tty_io.c

@@ -545,6 +545,7 @@ void tty_vhangup(struct tty_struct * tty)
 #endif
 	do_tty_hangup((void *) tty);
 }
+EXPORT_SYMBOL(tty_vhangup);
 
 int tty_hung_up_p(struct file * filp)
 {

drivers/serial/core.c

@@ -2472,6 +2472,8 @@ EXPORT_SYMBOL(uart_register_driver);
 EXPORT_SYMBOL(uart_unregister_driver);
 EXPORT_SYMBOL(uart_register_port);
 EXPORT_SYMBOL(uart_unregister_port);
+EXPORT_SYMBOL(uart_add_one_port);
+EXPORT_SYMBOL(uart_remove_one_port);
 
 MODULE_DESCRIPTION("Serial driver core");
 MODULE_LICENSE("GPL");