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Now that the clean rules don't require libraries/*/ghc.mk, we don't
have to build them on demand.  And having them built on demand
introduced a failure mode (where some libraries have ghc.mk and some
don't).

We still need to sort out the "install-docs" story to get this working
properly.

# -----------------------------------------------------------------------------
#
# (c) 2009 The University of Glasgow
#
# This file is part of the GHC build system.
#
# To understand how the build system works and how to modify it, see
#      http://hackage.haskell.org/trac/ghc/wiki/Building/Architecture
#      http://hackage.haskell.org/trac/ghc/wiki/Building/Modifying
#
# -----------------------------------------------------------------------------

On Windows, we end up doing something like
    rsync c:/build/ghc-6.10.1-unknown-mingw32.tar.bz2 haskell.org:dist
and it thinks that it is meant to get the file from the host called "c".
Now we just do
    rsync ghc-6.10.1-unknown-mingw32.tar.bz2 haskell.org:dist
so rsync understand what we mean.

It will use TH, so needs to be built with stage2.

This should stop us ending up without HsColour'ed sources on some
platforms.

We also now tell Cabal where to find HsColour, rather than it finding
it itself.

Fixes problems on Solaris, where we need to use gtar instead of tar

We now need to dig the appropriate lines out of packages, rather than
just catting libraries/extra-packages, in order to find out what the
extralibs are.

We don't want to require that users building source dists have alex/happy

e.g. $(bindir)/ghc-6.9.20080911

Hopefully this will fix the SunOS builbot slave.

One side-effect of this is that we need to build the install-utils with
stage2 rather than stage1 as we need the ghc package.

We now use an in-tree haddock instead

The packages file has an extra component (for "darcs" or "git") so we need
to take that into account when grepping.

We now set Validating=YES in mk/are-validating.mk rather than on the
commandline. This means that if you build a tree with validate then
just running make in it will use the validate flags.
"make distclean" removes mk/are-validating.mk, putting us back in
standard build mode.