faiss: restore passthru attributes

Without the change the `python3Packages.faiss.passthru` are broken:

    $ nix repl -f.
    nix-repl> python3Packages.faiss.passthru
      cudaPackages = «error: attribute 'cudaPackages' missing»;
      cudaSupport = «error: attribute 'cudaSupport' missing»;
      pythonSupport = «error: attribute 'pythonSupport' missing»;

Author: trofi

pkgs/development/libraries/science/math/faiss/default.nix

@@ -105,6 +105,10 @@ stdenv.mkDerivation {
     cp faiss/python/dist/*.whl "$dist/"
   '';
 
+  passthru = {
+    inherit cudaSupport cudaPackages pythonSupport;
+  };
+
   meta = {
     description = "Library for efficient similarity search and clustering of dense vectors by Facebook Research";
     mainProgram = "demo_ivfpq_indexing";