nix: add Security to build inputs.

For some reason, this is required to build nix on Big Sur, even though
it's not needed on earlier macOS versions.

pkgs/tools/package-management/nix/default.nix

@@ -3,6 +3,7 @@
 , stateDir ? "/nix/var"
 , confDir ? "/etc"
 , boehmgc
+, Security
 }:
 
 let
@@ -52,6 +53,7 @@ common =
         [ curl openssl sqlite xz bzip2 nlohmann_json
           brotli boost editline
         ]
+        ++ lib.optionals stdenv.isDarwin [ Security ]
         ++ lib.optional (stdenv.isLinux || stdenv.isDarwin) libsodium
         ++ lib.optionals is24 [ libarchive gmock ]
         ++ lib.optional withLibseccomp libseccomp

pkgs/top-level/all-packages.nix

@@ -28565,6 +28565,7 @@ in
       storeDir = config.nix.storeDir or "/nix/store";
       stateDir = config.nix.stateDir or "/nix/var";
       boehmgc = boehmgc.override { enableLargeConfig = true; };
+      inherit (darwin.apple_sdk.frameworks) Security;
       })
     nix
     nixStable