repro(nix): drop workaround for Darwin, now merged in Nixpkgs

flake.nix

@@ -314,34 +314,10 @@
               ];
 
               shellHook =
-                let
-                  # Workaround https://gitlab.haskell.org/ghc/ghc/-/issues/23138#note_567034
-                  # Pending fix upstream https://github.com/NixOS/nixpkgs/pull/317224
-                  libcxx-workaround = pkgs.symlinkJoin {
-                    name = "libcxx-workaround";
-                    paths = [ pkgs.libcxx ];
-                    postBuild = ''
-                      ln -s libc++${pkgs.stdenv.hostPlatform.extensions.sharedLibrary} $out/lib/c++
-                      ln -s libc++${pkgs.stdenv.hostPlatform.extensions.sharedLibrary} $out/lib/clang++
-                    '';
-                  };
-                in
                 ''
                   export GARGANTEXT_CORENLP_SERVER="nix -L run .#coreNLP"
 
                   cp -f ${pkgs.buildPackages.writeText "cabal.project.local" ''
-                    package accelerate
-                        cc-options:  -B${libcxx-workaround}/lib
-                        cxx-options: -B${libcxx-workaround}/lib
-                    package crawlerHAL
-                        cc-options:  -B${libcxx-workaround}/lib
-                        cxx-options: -B${libcxx-workaround}/lib
-                    package double-conversion
-                        cc-options:  -B${libcxx-workaround}/lib
-                        cxx-options: -B${libcxx-workaround}/lib
-                    package llvm-hs
-                        cc-options:  -B${libcxx-workaround}/lib
-                        cxx-options: -B${libcxx-workaround}/lib
                     -- Same fix as in haskell.nix's packages.haskell-igraph.components.library,
                     -- but for cabal-install
                     package haskell-igraph