Fix iOS build

nss.gyp

 # Copyright (c) 2012 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.
 
 {
   'target_defaults': {
     'configurations': {
       'Debug': {
         'defines': [
           'DEBUG',
@@ skipping 196 matching lines @@
                 'XP_UNIX',
                 'DARWIN',
                 'XP_MACOSX',
                 '_PR_PTHREADS',
                 'HAVE_BSD_FLOCK',
                 'HAVE_DLADDR',
                 'HAVE_LCHOWN',
                 'HAVE_SOCKLEN_T',
                 'HAVE_STRERROR',
               ],
+              'sources!': [
+                 # os_Darwin_x86.s and os_Darwin_x86_64.s are included by
+                 # os_Darwin.s.
+                 'nspr/pr/src/md/unix/os_Darwin_x86.s',
+                 'nspr/pr/src/md/unix/os_Darwin_x86_64.s',
+              ],
             }],
             ['component == "static_library"', {
               'defines': [
                 'NSPR_STATIC',
               ],
               'direct_dependent_settings': {
                 'defines': [
                   'NSPR_STATIC',
                 ],
               },
@@ skipping 748 matching lines @@
                   '-include', '<(forced_include_file)',
                 ],
               },
             }],
           ],
         },
       ],
     }],
   ],
 }