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It's not just when cleaning!

Stops the docs going out of sync with the code.

We need to include the DPH cleaning rules, even though we don't build DPH
when GhcProfiled = YES.

Reason: DPH uses Template Haskell and TH doesn't work 
in a profiled compiler

Revert this patch:
    Matthias Kilian <kili@outback.escape.de>**20090920181319
    Don't build haddock if HADDOC_DOCS = NO, and disable HADDOC_DOCS
        if GhcWithInterpreter = NO
    Haddock uses TcRnDriver.tcRnGetInfo, which is only available if
    GHCI is built. Set HADDOC_DOCS to NO if GhcWithInterpreter is NO,
    and disable the haddock build if HADDOC_DOCS = NO.

This fixes a problem with commands like gzip, where if $GZIP is exported
in the environment, then when make runs a command it'll put the Makefile
variable's value in the environment. But gzip treats $GZIP as arguments
for itself, so when we run gzip it thinks we're giving it "gzip" as an
argument.

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