Allow insecure openssl_1_1 at flake nixpkgs config level

flake.nix

@@ -24,7 +24,16 @@
     flake-utils.lib.eachDefaultSystem (
       system:
       let
-        pkgs = nixpkgs.legacyPackages.${system};
+        pkgs = nixpkgs.legacyPackages.${system}.extend (
+          final: prev: {
+            config = prev.config // {
+              permittedInsecurePackages = (prev.config.permittedInsecurePackages or [ ]) ++ [
+                # openssl_1_1 is EOL but needed to link vibe-d 0.9.8 TLS
+                "openssl-1.1.1w"
+              ];
+            };
+          }
+        );
       in
       {
         packages = import ./pkgs {