python scons\scons.py BF_BITNESS=32
python scons\scons.py BF_BITNESS=64
So from now on for Windows you don't have to run a specific win32 or win64 Python version
to get the Blender version you want. If you omit the BF_BITNESS flag the bitness as per
Python version will be used as before.
Note that this is an argument, so works *only* on the command-line, not in your user-config.py