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

src/trusted/validator/x86/validate_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.
 
 # Build the specific library dependencies for validating x86 code, used
 # by both the x86-32 and x86-64 validators.
 # Note: Would like to name this file validator_x86.gyp, but that name is
 # already used, and on mac's, this is not allowed.
 {
   'includes': [
@@ skipping 117 matching lines @@
           'type': 'static_library',
           'variables': {
             'target_base': 'ncval_base_verbose',
           },
           'dependencies': [
             'ncval_base_x86_64',
           ],
         },
       ],
     }],
-    [ 'target_arch=="arm"', {
-      'targets': []
-    }],
   ],
 }