python support appears broken in the ports trree

[Chris]

On Wed, 11 Dec 2019 06:21:29 +0100 Jan Beich jbeich at FreeBSD.org said

> Chris <portmaster at BSDforge.com> writes:
> 
> > I struggled all day yesterday with various ports barfing with similar
> > python messages. So today I blew everything off the disk, and started
> > from scratch. Which only repeats what happened yesterday. Is python
> > multiplicity no longer available? Or?
> 
> See bug 233723 or bug 237795. Build each port separately instead of relying
> on dependecy chaining should work. For best experience use poudriere.

Thank you very much for the insight, Jan!
Near as I can figure from the two bugs, I'm going to need to fix
Mk/python.mk

That should be a fun project. :P

Thanks again!

--Chris