[IronPython] Add reference to .dll located in above directory

[Dino Viehland]

Lukáš wrote:
> Yes, the above works for me too, but the following one does not:
> 
> F:\Product\1\Dlr\x\module > ipy foo.py

Even with the full path added to sys.path instead of the relative 
path?  Because this one works for me as well.