We don't actually have a stdio.h header file. Our printf() functions are

defined in vsprintf.h.  (This may change, since vsprintf.h is a
non-standard name, but for now it's the one to use.)

There should be no need to include vsprintf.h just for DBG() statements,
since include/compiler.h forces it in for a debug build anyway.

src/core/osloader.c

@@ -29,7 +29,6 @@ Modifications: Ken Yap (for Etherboot/16)
  * your option) any later version.
  */
 
-#include "stdio.h"
 #include "io.h"
 #include "memsizes.h"