haskellPackages.mkDerivation: enforce unix line endings in cabal files

Automatically use sed(1) to remove DOS line endings from .cabal files.
This is intended to work around Hackage producing revised cabal files
with DOS line endings (https://github.com/haskell/hackage-server/issues/316).
This frequently leads to

- patches failing to apply. Unfortunately there is no way to apply a
  patch with Unix line endings to a file with DOS line endings with
  GNU patch(1). Only the following combinations are supported:

  file  patch  comment
  Unix  Unix
  DOS   DOS    using --binary
  DOS   Unix   Haven't tested it, but I assume it works because
               patch(1) converts the file to Unix line endings
               implicitly (which can be disabled using --binary),
               but never the patch…

- Test suites sometimes involve the .cabal file which can be
  affected by the line endings.

This behavior is enabled by default to prevent cases where (unrevised)
packages regress when they get a revision later. Of course, the behavior
is a little nonsensical for non-Hackage packages, but it is probably
rarely an issue in practice. When DOS line endings need to be preserved,
the user can pass `dontConvertCabalFileToUnix = true`.

Supersedes #279248.
Resolves #206840.

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