Refactoring and tidy up in the build system
Instead of the ghc-stage and ghc-stage2-package files in a package, we now have a list of these in ghc.mk. There are other similar lists (of boot-packages and non-installable packages), so this is not too bad, and is simpler. While poking around in the top-level ghc.mk file I spotted various opportunities to clean up and re-order some of the cruft that has accumulated over time.
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