[Libreoffice] 8 combinations of Python support: do we really need that?

[Tor Lillqvist]

> Of course; and if that is what we want, to have just three clear 
> alternatives, then indeed I will go for it;)

Done now and pushed. Just the --enable-python option left, with four potential arguments: no, auto, system, internal.

The python scripting is now always enabled unless --enable-python=no. Ditto for the Python UNO API.

Seems to work as intended, but sure, I might have missed some corner case.

--tml