Build system improvements
We no longer use dummy-ghc; instead we don't configure most packages until the stage1 compiler is available. We also now use Cabal for building the ghc-bin package. There are a couple more sanity checks too.
We no longer use dummy-ghc; instead we don't configure most packages until the stage1 compiler is available. We also now use Cabal for building the ghc-bin package. There are a couple more sanity checks too.