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This checks that hackage would accept the packages.
Currently warnings are printed, but don't result in failure.

This is a bit kludgy. We've hit the maximum number of arguments you can
have in the for loop for adding files to the bindist list, so this just
splits the list in 2.

The .dyn_hi files currently depend on the .dyn_hi files of modules that
they import. But they actually want the .hi files of modules from
another package.This we make the .dyn_hi files depend on the .hi files
so we are sure that they exist and are up-to-date.

Rather than indirecting through an integer package

If Windows wasn't defined properly then the Win32 package wasn't being
cleaned, as it wasn't added to PACKAGES. Now we always add everything to
PACKAGES when CLEANING=YES.

We cache the old versions of files generated by configure, so that if
configure touches the file without changing it, we can detect that and
restore the timestamp.

integer-gmp's Integer is now wrapped by an Integer type in integer.

i.e. not dph, and hence not the stage 2 compiler.