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Spotted by Marco Túlio Gontijo e Silva

When using the bootstrapping compiler, we now explicitly constrain
the version of boot packages (Cabal, extensible-exceptions, etc) to the
in-tree version, so that the build system is less fragile should the
user have a newer version installed for the bootstrapping compiler.

Avoid using seq, as FreeBSD has jot instead.

They are now guaranteed to be YES

We now regenerate them when installing, which means the path for perl
doesn't get baked in

This works around the two filenames being the same on case-insensitive
file systems.

Partly this is cleaner as we only have to preprocess the source files
once, but also it is necessary to avoid Haddock recompiling source
files when Template Haskell is in use, saving some time in validate
and fixing a problem whereby when HADDOCK_DOCS=YES, make always
re-haddocks the DPH packages.  This also needs an additional fix to
GHC.

HsColour support still uses Cabal, and hence preprocesses the source
files again. We could move this into the build system too, but there
is a version dependency that would mean adding extra autoconf stuff.

Also tidied up the way configure.ac gets into bindists

We now just call gcc to get the dependencies directly

This is a rerecord of
    Stephen Blackheath <oversensitive.pastors.stephen@blacksapphire.com>**20090930222855
to avoid conflicts.

This meakes it easier to correctly clean libffi

So we don't try to recreate directories just because they are older
than mkdirhier, since mkdirhier won't touch them.

And add a comment explaining why these options are here

You can now have multiple versions of a package installed, and
gen_contents_index will do the right thing.

This means that we get the right program name in error messages etc.

See comments for details.

This means we can remove some conditional stuff from the Makefiles,
and means the testsuite doesn't have to work out whether or not it's
on Windows.