haskell.compiler.ghc*: Add `variantSuffix`.

When debugging musl builds, I often have to sift through thousands of lines
of `nix-store -q --tree` or `nix-store -qR` output.
Until now, `pkgsMusl` and normal `pkgs` GHCs looked exactly the same in
there, making that task tough.

Same for `integer-simple`, which makes debugging `gmp` issues easier.

This commit introduces a suffix to tell them apart easily.

Note that this is different from `targetPrefix` which is for
cross-compilation, which `pkgsMusl` does not do.

For GHC HEAD, integer-simple no longer exists, instead we now have a
“bignum backend”, so we just call the integer-simple successor
native-bignum.

Co-Authored-By: sternenseemann <sternenseemann@systemli.org>

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