Rip out hadrian subtree

Sadly subtrees haven't worked quite as well as we would have liked for
developers. See Hadrian #440.

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-# Building GHC on Windows

-

-[![Windows status](https://img.shields.io/appveyor/ci/snowleopard/hadrian/master.svg?label=Windows)](https://ci.appveyor.com/project/snowleopard/hadrian)

-

-Here is how you can build GHC, from source, on Windows. We assume that `git` and `stack` are installed

-(see [prerequisites](https://github.com/snowleopard/hadrian/blob/master/doc/windows.md#prerequisites)).

-

-```sh

-# Get GHC and Hadrian sources; git core.autocrlf should be set to false (see Prerequisites section)

-git clone --recursive git://git.haskell.org/ghc.git

-cd ghc

-git clone git://github.com/snowleopard/hadrian

-

-# Download and install the bootstrapping GHC and MSYS2

-cd hadrian

-stack setup

-

-# Install utilities required during the GHC build process

-stack exec -- pacman -S autoconf automake-wrapper make patch python tar --noconfirm

-

-# Build Hadrian and dependencies (including GHC dependencies Alex and Happy)

-stack build

-

-# Build GHC

-stack exec hadrian -- --directory ".." -j --flavour=quickest

-

-# Test GHC

-cd ..

-inplace\bin\ghc-stage2 -e 1+2

-```

-

-The entire process should take about 20 minutes. Note, this will build GHC without

-optimisations. If you need an optimised GHC, drop the `--flavour=quickest` flag from

-the build command line (this will slow down the build to about an hour).

-

-These are currently not the

-[official GHC building instructions](https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Windows),

-but are much simpler and may also be more robust.

-

-The `stack build` and `stack exec hadrian` commands can be replaced by an invocation

-of Hadrian's Stack-based build script: `build.stack.bat -j --flavour=quickest`. Use this

-script if you plan to work on Hadrian and/or rebuild GHC often.

-

-## Prerequisites

-

-The above works on a clean machine with `git` and `stack` installed (tested with default

-installation settings), which you can get from https://git-scm.com/download/win and

-https://www.stackage.org/stack/windows-x86_64-installer.

-

-Note that `git` should be configured to check out Unix-style line endings. The default behaviour

-of `git` on Windows is to check out Windows-style line endings which can cause issues during the

-build. This can be changed using the following command:

-

-    git config --global core.autocrlf false

-

-If you would like to restore the default behaviour later run:

-

-    git config --global core.autocrlf true

-

-## Testing

-

-These instructions have been tested on a clean Windows 10 machine using the

-[free VirtualBox image](https://dev.windows.com/en-us/microsoft-edge/tools/vms/windows/),

-and are also routinely tested on

-[Hadrian's AppVeyor CI instance](https://ci.appveyor.com/project/snowleopard/hadrian/history).

-

-## Notes

-

-Beware of the [current limitations of Hadrian](https://github.com/snowleopard/hadrian#current-limitations).