FromCabal.PostProcess: add opencascade-hs extra-include-dirs

Header files in the OpenCascade library are sorted under `include/opencascade`.

cabal2nix/src/Distribution/Nixpkgs/Haskell/FromCabal/PostProcess.hs

@@ -148,6 +148,7 @@ hooks =
   , ("network-attoparsec", set doCheck False) -- test suite requires network access
   , ("numeric-qq", set doCheck False) -- test suite doesn't finish even after 1+ days
   , ("opencv", opencvOverrides)
+  , ("opencascade-hs", set (configureFlags . contains "--extra-include-dir=${lib.getDev opencascade-occt}/include/opencascade") True)
   , ("pandoc >= 1.16.0.2 && < 2.5", set doCheck False) -- https://github.com/jgm/pandoc/issues/2709 and https://github.com/fpco/stackage/issues/1332
   , ("pandoc < 2.6", pandocPre26Overrides)
   , ("pandoc >= 2.6 && < 3.1.10", pandocPre3110Overrides) -- https://github.com/jgm/pandoc/commit/55227a20273267c236ec039c3e6559287a1dca45