[Distutils] pythonv: let's also make sure the standard Python install includes an "isolated" python

[Éric Araujo]

>>  (One exception is .pypirc.)
> Traditional dotfiles don't have extensions, and Greg was definitely a
> traditionalist.
Except that Greg’s code used .pydistutils.cfg and pydistutils.cfg;
.pypirc was a later addition by amk (PEP 301).

whippersnapperly yours