Add Android cross-compilation support for x86

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 637 matching lines @@
                     }],
                   ],
                 },
                 'sources': [
                   '../../src/platform-linux.cc',
                   '../../src/platform-posix.cc'
                 ],
               }
             ],
             ['OS=="android"', {
-                'defines': [
-                  'CAN_USE_VFP_INSTRUCTIONS',
+                'conditions': [
+                  ['v8_target_arch=="arm"', {
+                     'defines': [
+                       'CAN_USE_VFP_INSTRUCTIONS',
+                     ],
+                  }],
                 ],
                 'sources': [
                   '../../src/platform-posix.cc',
                 ],
                 'conditions': [
                   ['host_os=="mac"', {
                     'target_conditions': [
                       ['_toolset=="host"', {
                         'sources': [
                           '../../src/platform-macos.cc'
@@ skipping 336 matching lines @@
             }],
           ],
           'dependencies': [
             'v8'
           ],
         },
       ],
     }],
   ],
 }