Re: Replace uses of deprecated Python module distutils.sysconfig

I wrote:
> The early returns are not great: we have about half a dozen machines
> so far that are finding python3, and reporting sane-looking Python
> include paths, but not finding Python.h. They're all Linux-oid
> machines, so I suppose what is going on is that they have the base
> python3 package installed but not python3-dev or local equivalent.

> I want to leave that patch in place long enough so we can get a
> fairly full survey of which machines are OK and which are not,
> but I suppose I'll have to revert it tomorrow or so. We did
> promise the owners a month to adjust their configurations.

I have now reverted that patch, but I think this was a highly
worthwhile bit of reconnaissance. It identified 18 animals
that had incomplete python3 installations (versus only 13
that definitely or possibly lack python3 altogether). Their
owners most likely thought they were already good to go for the
changeover, so without this experiment we'd have had a whole lot
of buildfarm red when the real change is made.

I've notified the owners of these results.

regards, tom lane