Hadrian: Update instructions for building on Windows
The hadrian/doc/windows.md file has falled out of date. In particular
it still points to the old GitHub repository, and uses incorrect path
to GHC. This patch fixes it.
Edited by Andrey Mokhov
Due to a large amount of spam we do not allow new users to create repositories, they are "external" users. If you are a new user and want to create a repository, for example for forking GHC, open a new issue on ghc/ghc using the "get-verified" issue template
The hadrian/doc/windows.md file has falled out of date. In particular
it still points to the old GitHub repository, and uses incorrect path
to GHC. This patch fixes it.