Add ragel validator to SCONS

src/trusted/validator_ragel/unreviewed/decoder-x86_64.rl

Index: src/trusted/validator_ragel/unreviewed/decoder-x86_64.rl
===================================================================
--- src/trusted/validator_ragel/unreviewed/decoder-x86_64.rl	(revision 8217)
+++ src/trusted/validator_ragel/unreviewed/decoder-x86_64.rl	(working copy)
@@ -5,22 +5,17 @@
  */
 
 #include <assert.h>
-#include <elf.h>
-#include <inttypes.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include "decoder.h"
 
-#undef TRUE
-#define TRUE    1
+#include "native_client/src/include/elf32.h"
+#include "native_client/src/shared/utils/types.h"
+#include "native_client/src/trusted/validator_ragel/unreviewed/decoder.h"
 
-#undef FALSE
-#define FALSE   0
+#include "native_client/src/trusted/validator_ragel/gen/decoder-x86_64-instruction-consts.c"
 
-#include "decoder-x86_64-instruction-consts.c"
-
 %%{
   machine x86_64_decoder;
   alphtype unsigned char;