compile ghc-8.8.1

ghc no longer supports --with-ghc as is used here

        edo ./configure --prefix="${inst_location}" --with-ghc="${bootstrap_ghc}"

and instead requires the full path to ghc to be provided as an envvar, I'm guessing like this

        GHC=$(which ${bootstrap_ghc}) edo ./configure --prefix="${inst_location}"

I'm not aware of anything else that's changed.

My POSIX shell is not so great, I'd be happy to send a Merge Request to update the compile command but could you please help me to do the comparison on ${myghcver} ? Is there a numeric version available?

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