Compiling V8? Do not use Python x64!

When compiling Google V8 on Windows, do not use an AMD64 version of Python.
Firstly, the scons installer will not function, as it can’t find a python version in the registry.
Secondly, even if you just install scons manually, the V8 SConstruct file will fail. Because the return value from platform.machine() is now AMD64, the GuessArchitecture function in V8’s build script will not recognize a valid architecture, and the entire thing will fail.
If you just uninstall Python, and re-install an x86 version, everything will function fine.