x86, apic: remove IRQ_DEST_MODE

Remove leftover definition.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/include/asm/mach-default/mach_apic.h

@@ -22,7 +22,6 @@ static inline const struct cpumask *target_cpus(void)
 
 #ifdef CONFIG_X86_64
 #include <asm/genapic.h>
-#define IRQ_DEST_MODE (apic->irq_dest_mode)
 #define TARGET_CPUS	  (apic->target_cpus())
 #define init_apic_ldr (apic->init_apic_ldr)
 #define cpu_mask_to_apicid (apic->cpu_mask_to_apicid)