package: pass our own lix to perl-bindings

I don't know how this was missed or no one really complained about it,
but perl-bindings was using CppNix if nix was not overlaid to our own
Lix.

If you overlay Lix manually, the resulting Lix's perl-bindings cannot
really refer to Lix itself, therefore, it's CppNix.

Change-Id: Ie5ce95564cb7fb5444acbea6124619c5121e1576
Signed-off-by: Raito Bezarius <raito@lix.systems>

package.nix

@@ -733,7 +733,10 @@ stdenv.mkDerivation (finalAttrs: {
         }
       );
 
-    perl-bindings = pkgs.callPackage ./perl { inherit fileset stdenv; };
+    perl-bindings = pkgs.callPackage ./perl {
+      inherit fileset stdenv;
+      nix = finalAttrs.finalPackage;
+    };
 
     binaryTarball = pkgs.callPackage ./nix-support/binary-tarball.nix {
       nix = finalAttrs.finalPackage;