Add missing headers for compilation on x86 targets

Change-Id: I5f4dc797b353a0f01fa00d38375ec303bf863254
diff --git a/toolbox/dd.h b/toolbox/dd.h
index 794a464..cca1024 100644
--- a/toolbox/dd.h
+++ b/toolbox/dd.h
@@ -35,6 +35,8 @@
  *	@(#)dd.h	8.3 (Berkeley) 4/2/94
  */
 
+#include <stdint.h>
+
 /* Input/output stream state. */
 typedef struct {
 	u_char		*db;		/* buffer address */