Adding (some) libraries to a GHC tree

[Jost Berthold]

Simon Peyton-Jones wrote:
> great. Can you just do the merge?  You are hereby appointed an "accredited
> wiki maintainer"!

Thank you :) I edited GettingTheSources as we said, and removed the links
from the /Building page.
Neil,
   if you think the extra links should be kept, sorry and please revert.

Jost