All of these exports and the need for the one additional symbol
disappeared somewhere between 2.6.5 and 2.6.16.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

--- a/drivers/xen/core/machine_reboot.c
+++ b/drivers/xen/core/machine_reboot.c
@@ -52,11 +52,6 @@ void machine_power_off(void)
 	HYPERVISOR_shutdown(SHUTDOWN_poweroff);
 }
 
-int reboot_thru_bios = 0;	/* for dmi_scan.c */
-EXPORT_SYMBOL(machine_restart);
-EXPORT_SYMBOL(machine_halt);
-EXPORT_SYMBOL(machine_power_off);
-
 static void pre_suspend(void)
 {
 	HYPERVISOR_shared_info = (shared_info_t *)empty_zero_page;