bug#36692: [PATCH (unified, replaces previous patches)] gnu: Add GHC 8.6.5

[Timothy Sample]

Hi Robert,

Robert Vollmert <address@hidden> writes:

> This is exactly like GHC 8.4, except for:
> - the sources
> - depends on ghc-8.4 as ghc-bootstrap, since it has a
>   minimum requirement of GHC 8.2 as a bootstrap compiler
> - explicitly skip two failing tests

I simplified the package by reusing the inputs and arguments from
“ghc-8.4”.  I also made changing “ghc-8” its own commit.

Pushed as a62ddb748f–cce84c34cd.  Thanks!

> (Apparently, those tests also fail on older versions, but
> for unclear reasons the packages still build successfully.)

It would be nice if we could make the old versions fail and fix or
disable the failing tests.


-- Tim