Add nacl_sdk gyp meta-target.

src/shared/gio/gio.gyp

 # Copyright (c) 2011 The Chromium 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',
   ],
   'variables': {
     'common_sources': [
@@ skipping 13 matching lines @@
       'type': 'static_library',
       'sources': [
         '<@(trusted_sources)',
       ],
     },
     {
       'target_name': 'gio_lib',
       'type': 'none',
       'variables': {
         'nlib_target': 'libgio.a',
+        'nso_target': 'libgio.so',
         'build_glibc': 1,
         'build_newlib': 1,
         'sources': ['<@(common_sources)']
       },
       'dependencies': [
         '<(DEPTH)/native_client/tools.gyp:prep_toolchain',
       ],
     },
   ],
   'conditions': [
     ['OS=="win"', {
       'targets': [
         {
           'target_name': 'gio64',
           'type': 'static_library',
             'sources': [
               '<@(trusted_sources)',
             ],
           'variables': {
             'win_target': 'x64',
           },
         }
       ],
     }],
   ],
 }