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

src/trusted/validator_x86/validator_x86.gyp

 # Copyright (c) 2011 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.
 
 # TODO(bradchen): eliminate need for the warning flag removals below
 {
   'includes': [
     '../../../build/common.gypi',
   ],
   'target_defaults': {
@@ skipping 54 matching lines @@
       'targets': [
         {
           'target_name': 'nccopy_x86_64',
           'type': 'static_library',
           'hard_dependency': 1,
           'variables': {
             'target_base': 'nccopy',
           },
         }],
     }],
-    [ 'target_arch=="arm"', {
-      'targets': []
-    }],
   ],
 }