validator_ragel: Link into TCB, use under env var

src/trusted/validator/x86/64/validator_x86_64.gyp

-# Copyright (c) 2011 The Native Client Authors. All rights reserved.
+# Copyright (c) 2012 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Build the specific library dependencies for validating on x86-64
 {
   'includes': [
     '../../../../../build/common.gypi',
   ],
   'target_defaults': {
     'variables': {
@@ skipping 73 matching lines @@
           'hard_dependency': 1,
         },
       ],
     }],
     [ 'target_arch=="arm" or target_arch=="ia32"', {
       'targets': []
     }],
   ],
 }