Proof of concept dynamic FFI

[Jon Wilson]

Hi,
I've written a bit of code that lets you call any function from a 
dynamically loaded shared lib with any args.  Well, actually, since it 
is just a proof of concept, it only lets you call functions that take 
zero or one args.  The arg (if there is one) must be of type int.  The 
return type can be either void or int.

If you want to play, you can get the code by
bzr branch http://bzr.wilsonjc.us/foreign/
or by just grabbing the files from that URL manually.  The README 
contains brief instructions on how to try it out.

If I'm just reinventing the wheel, or if you can think of a better way 
to do it, or if you just think I look funny, let me know.
Regards,
Jon Wilson