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

src/trusted/validator_arm/ncval.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.
 
 {
   'includes': [
     '../../../build/common.gypi',
   ],
   'conditions': [
     ['target_arch=="ia32"', {
@@ skipping 17 matching lines @@
           'type': 'executable',
           'sources': [ 'ncval.cc' ],
           'dependencies': [
             '<(DEPTH)/native_client/src/trusted/validator/ncfileutils.gyp:ncfileutils_x86_64',
             'validator_arm.gyp:arm_validator_core',
             'validator_arm.gyp:arm_validator_reporters',
             '<(DEPTH)/native_client/src/shared/platform/platform.gyp:platform',
           ],
         }],
     }],
-    ['target_arch=="arm"', {
-      'targets': [],
-    }],
   ],
 }