x86: surround apic headers in apic definitions

Although those constants are always defined in x86_64,
and will have the effect of just including the headers
in the very way we did before, I'm doing this in a separate
patch to be conservative and avoid surprises.
Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

include/asm-x86/smp_64.h

@@ -7,9 +7,13 @@
 /*
  * We need the APIC definitions automatically as part of 'smp.h'
  */
-#include <asm/apic.h>
-#include <asm/io_apic.h>
-#include <asm/mpspec.h>
+#ifdef CONFIG_X86_LOCAL_APIC
+#  include <asm/mpspec.h>
+#  include <asm/apic.h>
+#  ifdef CONFIG_X86_IO_APIC
+#   include <asm/io_apic.h>
+#  endif
+#endif
 #include <asm/pda.h>
 #include <asm/thread_info.h>