Adds tls_edit utility which patches irt_core.nexe's TLS usage.

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': [
       'gio.c',
       'gio_mem.c',
       'gprintf.c',
       'gio_mem_snapshot.c',
     ],
     'trusted_sources': [
       '<@(common_sources)',
       'gio_pio.c',
     ],
   },
   'targets': [
     {
       'target_name': 'gio',
       'type': 'static_library',
+      # tls_edit relies on gio which is always built for the host platform.
+      'toolsets': ['host', 'target'],
       'sources': [
         '<@(trusted_sources)',
       ],
     },
     {
       'target_name': 'gio_lib',
       'type': 'none',
       'variables': {
         'nlib_target': 'libgio.a',
         'nso_target': 'libgio.so',
@@ skipping 18 matching lines @@
               '<@(trusted_sources)',
             ],
           'variables': {
             'win_target': 'x64',
           },
         }
       ],
     }],
   ],
 }