minimal-bootstrap: fix the eval (rewriteURL fallout) (#414769)

pkgs/top-level/all-packages.nix

···
       inherit lib config;
       fetchurl = import ../build-support/fetchurl/boot.nix {
         inherit (stdenv.buildPlatform) system;
+        inherit (config) rewriteURL;
       };
       checkMeta = callPackage ../stdenv/generic/check-meta.nix { inherit (stdenv) hostPlatform; };
     }