Changes to make fptools insfrastructure usable for standalone libraries

[Simon Marlow]

Hi Alastair,

> I've been playing with how to add Hugs support to the fptools 
> infrastructure.  
> I didn't get as far as I'd hoped but thought I'd run what I 
> had past you for comments.
> 
> Full diffs are attached but the basic idea is to use the 
> --with-hc option to 
> set a variable 'ForSystem' to one of HUGS, GHC, NHC or UNKNOWN.

That approach sounds fine to me - in fact that's the way I'd imagined
doing it, although I'd call it $(HcFlavour) or $(HcType) instead of
$(ForSystem).

Cheers,
	Simon