[PATCH] ipmi build fix

From: Geert Uytterhoeven <geert@linux-m68k.org>

While compiling drivers/char/ipmi/ipmi_si_intf.c in 2.6.6-rc1 on m68k, I
noticed a missing include (needed for disable_irq_nosync() and enable_irq())

drivers/char/ipmi/ipmi_si_intf.c

@@ -51,6 +51,7 @@
 #include <linux/list.h>
 #include <linux/pci.h>
 #include <linux/ioport.h>
+#include <linux/irq.h>
 #ifdef CONFIG_HIGH_RES_TIMERS
 #include <linux/hrtime.h>
 # if defined(schedule_next_int)