Pull necessary dependencies to be able to process mojo.gyp on iOS

third_party/libxslt/libxslt.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'conditions': [
       ['os_posix == 1 and OS != "mac"', {
         'os_include': 'linux'
       }],
       ['OS=="mac"', {'os_include': 'mac'}],
       ['OS=="win"', {'os_include': 'win32'}],
     ],
     # We used to have a separate flag for using the system
     # libxslt, but it seems mixing Chrome libxml and system
     # libxslt causes crashes that nobody has had time to diagnose.
     # So just put them both behind the same flag for now.
     'use_system_libxml%': 0,
   },
   'targets': [
     {
       'target_name': 'libxslt',
       'conditions': [
-        ['os_posix == 1 and OS != "mac" and use_system_libxml', {
+        ['os_posix == 1 and OS != "mac" and OS != "ios" and use_system_libxml', {
           'type': 'none',
           'direct_dependent_settings': {
             'cflags': [
               '<!@(pkg-config --cflags libxslt)',
             ],
           },
           'link_settings': {
             'ldflags': [
               '<!@(pkg-config --libs-only-L --libs-only-other libxslt)',
             ],
@@ skipping 78 matching lines @@
             ],
           },
           'conditions': [
             ['OS!="win"', {'product_name': 'xslt'}],
           ],
         }],
       ],
     },
   ],
 }