no-Haddock GHC build

[Donn Cave]

I'm thinking it would be expedient to omit Haddock while building a
ghc 6.11 snapshot, per bug ticket #3531

>From my basic understanding of its purpose there, that ought to work out
fine - I mean, not to undervalue documentation, but the compiler should
be able to function without it.  But not well versed in the intricacies
of the GHC build, so please set me straight if I'm about to waste a lot
of time untangling it in the makefiles.

thanks!

	Donn Cave, donn at avvanta.com