[PATCH] x86 uniproc compile fix

Fix uniprocessor compilation.

do_timer.h needs asm/mpspec.h for the declaration of `using_apic_timer'

arch/i386/kernel/timers/timer_pit.c

@@ -6,6 +6,7 @@
 #include <linux/spinlock.h>
 #include <linux/module.h>
 #include <linux/device.h>
+#include <asm/mpspec.h>
 #include <asm/timer.h>
 #include <asm/io.h>