Add msvs_configuration_platform to common.gypi to allow x64 builds on Windows

build/common.gypi

 # 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 209 matching lines @@
           'V8_TARGET_ARCH_X64',
         ],
         'xcode_settings': {
           'ARCHS': [ 'x86_64' ],
         },
         'msvs_settings': {
           'VCLinkerTool': {
             'StackReserveSize': '2097152',
           },
         },
+        'msvs_configuration_platform': 'x64',
       }],  # v8_target_arch=="x64"
       ['v8_use_liveobjectlist=="true"', {
         'defines': [
           'ENABLE_DEBUGGER_SUPPORT',
           'INSPECTOR',
           'OBJECT_PRINT',
           'LIVEOBJECTLIST',
         ],
       }],
       ['v8_compress_startup_data=="bz2"', {
@@ skipping 153 matching lines @@
                 'OptimizeReferences': '2',
                 'EnableCOMDATFolding': '2',
               },
             },
           }],  # OS=="win"
         ],  # conditions
       },  # Release
     },  # configurations
   },  # target_defaults
 }