x86: fully honor "nolapic", fix

Impact: build fix
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/apic.c

@@ -1131,7 +1131,9 @@ void __cpuinit setup_local_APIC(void)
 	int i, j;
 
 	if (disable_apic) {
+#ifdef CONFIG_X86_IO_APIC
 		disable_ioapic_setup();
+#endif
 		return;
 	}