haskell-ng: move configuration know-how out of cabal2nix and into Nixpkgs

pkgs/development/haskell-modules/hackage-packages.nix

@@ -79215,7 +79215,7 @@ self: {
 
   "mime-mail" = callPackage
     ({ mkDerivation, base, base64-bytestring, blaze-builder, bytestring
-     , filepath, hspec, process, random, sendmail ? "sendmail", text
+     , filepath, hspec, process, random, text
      }:
      mkDerivation {
        pname = "mime-mail";
@@ -79226,7 +79226,6 @@ self: {
          random text
        ];
        testDepends = [ base blaze-builder bytestring hspec text ];
-       configureFlags = "--ghc-option=-DMIME_MAIL_SENDMAIL_PATH=\"${sendmail}\"";
        homepage = "http://github.com/snoyberg/mime-mail";
        description = "Compose MIME email messages";
        license = stdenv.lib.licenses.mit;
@@ -114530,7 +114529,6 @@ self: {
          test-framework-hunit test-framework-quickcheck2 test-framework-th
          time tzdata unix vector
        ];
-       preConfigure = "export TZDIR=${tzdata}/share/zoneinfo";
        homepage = "https://github.com/nilcons/haskell-tz";
        description = "Efficient time zone handling";
        license = stdenv.lib.licenses.asl20;