[Windows] Automatically run PC\layout after building python.exe

[gvanrossum]

On Windows, after building a python.exe, before using it to run pyperformance, you need to run a special command PC\layout, which creates an installed-like tree structure, and then use the python.exe from that tree. It would be nice if this was automatically done by the compile command.

See #148 (comment) and ff. for more details.