Fix android_arm build hosted on Mac

tools/gyp/v8.gyp

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 1733 matching lines @@
               '../../src/base/platform/platform-posix.cc'
             ],
           }
         ],
         ['OS=="android"', {
             'sources': [
               '../../src/base/platform/platform-posix.cc'
             ],
             'link_settings': {
               'target_conditions': [
-                ['_toolset=="host"', {
+                ['_toolset=="host" and host_os!="mac"', {
                   # Only include libdl and librt on host builds because they
                   # are included by default on Android target builds, and we
                   # don't want to re-include them here since this will change
                   # library order and break (see crbug.com/469973).
+                  # These libraries do not exist on Mac hosted builds.
                   'libraries': [
                     '-ldl',
                     '-lrt'
                   ]
                 }]
               ]
             },
             'conditions': [
               ['host_os=="mac"', {
                 'target_conditions': [
@@ skipping 501 matching lines @@
         }],
         ['want_separate_host_toolset==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }