ghc-8.10 Change for F35

[Jens-Ulrik Petersen]

Hi Haskell SIG,

I just submitted a F35 Change to update ghc to 8.10 and Stackage 18:
https://fedoraproject.org/wiki/Changes/GHC_8.10_%26_Stackage_18

Unfortunately there is but 2 weeks left to complete the work,
which I had originally started but not pushed for F34 with LTS 17.

If anyone wants to help update their main branches to LTS 18 in git
so I can build it all together, please let me know so we can coordinate the
work.

Thanks,
Jens