cc-wrapper: Remove unused params

Ensured hashes unchanged and eval succeeds in tarball job

pkgs/stdenv/nix/default.nix

@@ -13,12 +13,10 @@ bootStages ++ [
     inherit config overlays;
 
     stdenv = import ../generic rec {
-      buildPlatform = localSystem;
-      hostPlatform = localSystem;
-      targetPlatform = localSystem;
-
       inherit config;
 
+      inherit (prevStage.stdenv) buildPlatform hostPlatform targetPlatform;
+
       preHook = ''
         export NIX_ENFORCE_PURITY="''${NIX_ENFORCE_PURITY-1}"
         export NIX_ENFORCE_NO_NATIVE="''${NIX_ENFORCE_NO_NATIVE-1}"
@@ -27,8 +25,6 @@ bootStages ++ [
 
       initialPath = (import ../common-path.nix) { pkgs = prevStage; };
 
-      inherit (prevStage.stdenv) hostPlatform targetPlatform;
-
       cc = import ../../build-support/cc-wrapper {
         nativeTools = false;
         nativePrefix = stdenv.lib.optionalString hostPlatform.isSunOS "/usr";