stdenvNoCC: fix `extraBuildInputs` on Darwin

Closes: #371465
Fixes: 4928668e21d1efb681434c1caa95c449db9dd599

pkgs/top-level/stage.nix

···
 
   # `stdenv` without a C compiler. Passing in this helps avoid infinite
   # recursions, and may eventually replace passing in the full stdenv.
-  stdenvNoCC ? (
-    stdenv.override {
+  stdenvNoCC ? stdenv.override (
+    {
       cc = null;
       hasCC = false;
     }