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Previously a very fragile heuristic was used. Now we explicitly declare
this.

Perhaps a better option in the future would be to instead emit this
information from `ghc-cabal` and pick it up from `package-data.mk`.

Fixes #9.

Also add (currently broken) Unicode support although this is broken by
Shake, the console output interface of which is badly broken (see
Shake #364)

HsColour also depends upon the sources existing. Fixes #6.

See GHC commit 4905b83a.

As of GHC commit 314395e0.

Since 314395e0

Since GHC commit 6338a1cc.