cabal2nix: Support testFlags argument

[sternenseemann]

cc @TeofilC

[sternenseemann]

Result (compared to master):

diff --git a/pkgs/development/haskell-modules/hackage-packages.nix b/pkgs/development/haskell-modules/hackage-packages.nix
index 503a37fe3a30..52bf3d668f4a 100644
--- a/pkgs/development/haskell-modules/hackage-packages.nix
+++ b/pkgs/development/haskell-modules/hackage-packages.nix
@@ -157039,7 +157039,7 @@ self: {
          wai wai-logger warp warp-tls zlib
        ];
        executableHaskellDepends = [ base ];
-       testTargets = [ "--test-option=--no-net" ];
+       testFlags = [ "--no-net" ];
        description = "Haskell API Search";
        license = lib.licenses.bsd3;
        mainProgram = "hoogle";
@@ -163560,7 +163560,10 @@ self: {
          transformers
        ];
        testToolDepends = [ hspec-meta ];
-       testTargets = [ "--test-option=--skip" "--test-option='Test.Hspec.Core.Runner.hspecResult runs specs in parallel'" ];
+       testFlags = [
+         "--skip"
+         "'Test.Hspec.Core.Runner.hspecResult runs specs in parallel'"
+       ];
        description = "A Testing Framework for Haskell";
        license = lib.licenses.mit;
        hydraPlatforms = lib.platforms.none;
@@ -163589,7 +163592,10 @@ self: {
          temporary tf-random time transformers
        ];
        testToolDepends = [ hspec-meta ];
-       testTargets = [ "--test-option=--skip" "--test-option='Test.Hspec.Core.Runner.hspecResult runs specs in parallel'" ];
+       testFlags = [
+         "--skip"
+         "'Test.Hspec.Core.Runner.hspecResult runs specs in parallel'"
+       ];
        description = "A Testing Framework for Haskell";
        license = lib.licenses.mit;
      }) {};

[sternenseemann]

Added changelog.