Move attributes in ompss2 clang derivation to passthru

Currently, we can use bscpkgs similarly to nixpkgs either through
the flake outputs or with import bscpkgs:

```nix
# currently supported:
bscpkgs.legacyPackages.x86_64-linux.hello
let pkgs = import bscpkgs { system = "x86_64-linux"; }; in pkgs.hello
```
The missing piece is nixpkgs.lib (not pkgs.lib, the system agnostic
one). The workaround is to do bscpkgs.inputs.nixpkgs.lib instead. We can
simplify this by forwarding the lib to our outputs.

This enables us to use bscpkgs as a drop-in
replacing the inputs to our flake from nixpkgs to bscpkgs.
(inputs.nixpkgs.url = "<*BSC*pkgs url>").


Reviewed-by: Rodrigo Arias Mallo <rodrigo.arias@bsc.es>
Tested-by: Aleix Boné <abonerib@bsc.es>

flake.nix

@@ -13,5 +13,8 @@
       bscOverlay = import ./overlay.nix;
       overlays.default = self.bscOverlay;
       legacyPackages.x86_64-linux = pkgs;
+
+      # propagate nixpkgs lib, so we can do bscpkgs.lib
+      inherit (nixpkgs) lib;
     };
 }

pkgs/llvm-ompss2/clang.nix

@@ -43,19 +43,21 @@ let
 
   source = if (useGit) then git else release;
 
-in stdenv.mkDerivation rec {
+in stdenv.mkDerivation {
   pname = "clang-ompss2";
   inherit (source) src version;
 
   enableParallelBuilding = true;
-  isClang = true;
 
   passthru = {
     CC = "clang";
     CXX = "clang++";
-  };
 
-  isClangWithOmpss = true;
+    isClang = true;
+    isClangWithOmpss = true;
+
+    inherit gcc zlib;
+  };
 
   nativeBuildInputs = [ zlib ];