Use %I64 and not %ll when using OS printf if compiling for windows.

include/grub/emu/misc.h

@@ -42,6 +42,14 @@ char *grub_make_system_path_relative_to_its_root (const char *path)
 int
 grub_util_device_is_mapped (const char *dev);
 
+#ifdef __MINGW32__
+#define GRUB_HOST_PRIuLONG_LONG "I64u"
+#define GRUB_HOST_PRIxLONG_LONG "I64x"
+#else
+#define GRUB_HOST_PRIuLONG_LONG "llu"
+#define GRUB_HOST_PRIxLONG_LONG "llx"
+#endif
+
 void * EXPORT_FUNC(xmalloc) (grub_size_t size) WARN_UNUSED_RESULT;
 void * EXPORT_FUNC(xrealloc) (void *ptr, grub_size_t size) WARN_UNUSED_RESULT;
 char * EXPORT_FUNC(xstrdup) (const char *str) WARN_UNUSED_RESULT;