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There is now less makefile code duplication.
Also, stage2 packages are registered after GHC, which is important as
they might depend on the ghc package (as dph now does).

We now use an msys/mingw perl tarball

This is the case on Windows (as we have no shell wrappers), and mingw's
shell doesn't like an empty list of things in a "for" command.

Now that we make bindists during validate, we can't assume that ISCC
is available.

To quiet those warnings from make about not being able to delete
directories.

There are now 104 calls to mkdirhier, down from 1201, when validating.

This should catch make going into an infinite loop.

We now do all the hard work in a bindistprep subdirectory, and just move
the result to the root directory. This way we can delete anything in
bindistprep/ without worrying about deleting anything important.

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 at least one problem: libHSffi-ghc<version>.so wasn't being
cleaned, because $(dyn_libsuf) wasn't defined while cleaning.

They no longer exist.

 - the package DB is a directory containing one file per package
   instance (#723)

 - there is a binary cache of the database (#593, #2089)

 - the binary package is now a boot package

 - there is a new package, bin-package-db, containing the Binary
   instance of InstalledPackageInfo for the binary cache.

Also included in this patch

 - Use colour in 'ghc-pkg list' to indicate broken or hidden packages
  
   Broken packages are red, hidden packages are 
  
   Colour support comes from the terminfo package, and is only used when
    - not --simple-output
    - stdout is a TTY
    - the terminal type has colour capability

 - Fix the bug that 'ghc-pkg list --user' shows everything as broken