[PATCH] Fix BUG() decl warning in smp.h for UP

x86 always seems to include asm/page.h, PPC (and presumably others)
don't.

include/linux/smp.h

@@ -86,6 +86,7 @@ int cpu_up(unsigned int cpu);
 void smp_prepare_boot_cpu(void);
 
 #else /* !SMP */
+#include <asm/page.h> /* For BUG() */
 
 /*
  *	These macros fold the SMP functionality into a single CPU system