The tarball download URLs seem to have changed, so we adjust them in
case anyone wants to reproduce the source of ghc8102Binary and
ghc865Binary.
Tested for x86_64-linux, i686-linux, aarch64-linux, x86_64-darwin.
Resolves#121804.
x86_64-linux
Ben Gamari's patch from #85924.
Fixes#85924, allowing one to bootstrap GHC in `pkgsMusl`
`nix-build -A pkgsMusl.haskellPackages.hello` succeeds with this patch.