[MIPS] Add support to gyp files to build Native Client inside of Chromium

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

 # 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': {
@@ skipping 68 matching lines @@
             'target_base': 'ncvalidate_verbose_x86_64',
           },
           'dependencies': [
             'ncvalidate_x86_64',
             '<(DEPTH)/native_client/src/trusted/validator/x86/ncval_reg_sfi/ncval_reg_sfi.gyp:ncval_reg_sfi_verbose_x86_64'
           ],
           'hard_dependency': 1,
         },
       ],
     }],
-    [ 'target_arch=="arm" or target_arch=="ia32"', {
+    [ 'target_arch!="x64"', {
       'targets': []
     }],
   ],
 }