haskellSrc2nix

Since [1], cabal2nix has been able to parse full platform triples. We
need this for when the system doesn't say enough info (e.g. android).

[1]: https://github.com/NixOS/cabal2nix/commit/0bb88f0009710e013564f24c195fd037e766310e#diff-d9172aeec4039eef8cfcc8a2ab6c0677R143

pkgs/development/haskell-modules/make-package-set.nix

@@ -133,7 +133,7 @@ let
       installPhase = ''
         export HOME="$TMP"
         mkdir -p "$out"
-        cabal2nix --compiler=${self.ghc.haskellCompilerName} --system=${hostPlatform.system} ${sha256Arg} "${src}" ${extraCabal2nixOptions} > "$out/default.nix"
+        cabal2nix --compiler=${self.ghc.haskellCompilerName} --system=${hostPlatform.config} ${sha256Arg} "${src}" ${extraCabal2nixOptions} > "$out/default.nix"
       '';
   };