nixos/nix: wrap nix once

nix-os/nix.nix

@@ -23,6 +23,9 @@ let
         --add-flags "--log-format" \
         --add-flags "bar"
     '';
+    passthru = {
+      inherit (pkgs.nix) man meta version;
+    };
   };
 
   wrappedNixosExecutables = pkgs.symlinkJoin {
@@ -37,18 +40,9 @@ let
         --add-flags "bar"
     '';
   };
-
-
-  wrappedNix = (pkgs.symlinkJoin {
-    name = "wrappedNix-${pkgs.nix.version}";
-    paths = [ pkgs.nix ] ++ [( wrappedNixExecutables false )];
-  }).overrideAttrs {
-    version = pkgs.nix.version;
-    passthru.meta = pkgs.nix.meta;
-  };
 in {
   config = {
-    nix.package = wrappedNix;
+    nix.package = wrappedNixExecutables false;
     environment.systemPackages = lib.map (lib.hiPrio) [
       (wrappedNixExecutables true)
       wrappedNixosExecutables