[Arm]: Simplify compile-time Arm feature detection.

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 819 matching lines @@
                 '-lrt'
               ]
             },
             'sources': [  ### gcmole(os:linux) ###
               '../../src/platform-linux.cc',
               '../../src/platform-posix.cc'
             ],
           }
         ],
         ['OS=="android"', {
-            'defines': [
-              'CAN_USE_VFP_INSTRUCTIONS',
-            ],
             'sources': [
               '../../src/platform-posix.cc'
             ],
             'conditions': [
               ['host_os=="mac"', {
                 'target_conditions': [
                   ['_toolset=="host"', {
                     'sources': [
                       '../../src/platform-macos.cc'
                     ]
@@ skipping 391 matching lines @@
         }],
         ['v8_compress_startup_data=="bz2"', {
           'libraries': [
             '-lbz2',
           ]
         }],
       ],
     },
   ],
 }