a tiny fix to Python hooks in INN

[Ilya Etingof]

> Well, we're talking about something that's run once at the start of the
> program.   Something like this in PYsetup() ought to be fine without
> adding to the library:

Agreed....but then this code would have to be dup'ed in Python interface
to nnrpd....

> No problem with the portability question, but why swat a flea with a
> backhoe?

Just for commonness. ;-) What if some other INN component would eventually
make use of setenv()?

-ilya