tests.config.allowPkgsInPermittedInsecurePackages: set system

The called function defaults to `builtins.currentSystem` which does not work in pure-eval

pkgs/test/config.nix

@@ -1,4 +1,8 @@
-{ lib, ... }:
+{
+  lib,
+  pkgs,
+  ...
+}:
 lib.recurseIntoAttrs {
 
   # https://github.com/NixOS/nixpkgs/issues/175196
@@ -11,13 +15,14 @@ lib.recurseIntoAttrs {
   # Instead of `builtins.seq`, the list may be constructed based on actual package info.
   allowPkgsInPermittedInsecurePackages =
     let
-      pkgs = import ../.. {
+      pkgs' = import ../.. {
+        system = pkgs.stdenv.hostPlatform.system;
         config = {
-          permittedInsecurePackages = builtins.seq pkgs.glibc.version [ ];
+          permittedInsecurePackages = builtins.seq pkgs'.glibc.version [ ];
         };
       };
 
     in
-    pkgs.hello;
+    pkgs'.hello;
 
 }