[PATCH] Make ACPI_SLEEP select SOFTWARE_SUSPEND

CONFIG_ACPI_SLEEP doesn't compile without SOFTWARE_SUSPEND.
Make it select it automagically.

This fixes some bugzilla bug whose number I forgot.

drivers/acpi/Kconfig

@@ -69,6 +69,7 @@ config ACPI_SLEEP
 	bool "Sleep States (EXPERIMENTAL)"
 	depends on X86 && ACPI
 	depends on EXPERIMENTAL && PM
+	select SOFTWARE_SUSPEND
 	default y
 	---help---
 	  This option adds support for ACPI suspend states.