Issue with 9term in devel/plan9port

[Bakul Shah]

> > I'm noticing a peculiar behavior in 9term where '%' gets printed
> > in between every prompt.  I built the same on Linux and I didn't see
> > this, so either there's an issue with my setup or a bonafide bugs.
> 
> What is your prompt?  Could you show a snippet of 
> terminal window demonstrating the problem?

I suspect this has to do with ncurses, not p9p.  I see this
problem in 9term running zsh but not rc or /bin/sh.  I see
something similar when running zsh on the console and when
TERM is set to xterm (instead of cons25).