treewide: remove unused variables (#63177)

* treewide: remove unused variables

* making ofborg happy

pkgs/stdenv/darwin/default.nix

@@ -199,7 +199,6 @@ in rec {
       ninja = super.ninja.override { buildDocs = false; };
       darwin = super.darwin // {
         cctools = super.darwin.cctools.override {
-          llvm = null;
           enableTapiSupport = false;
         };
       };

pkgs/stdenv/darwin/make-bootstrap-tools.nix

@@ -12,9 +12,7 @@ in rec {
     singleBinary = false;
   });
 
-  # We want a version of cctools without LLVM, because the LTO support ends up making
-  # the bootstrap tools huge and isn't really necessary for bootstrap
-  cctools_ = darwin.cctools.override { llvm = null; };
+  cctools_ = darwin.cctools;
 
   # Avoid debugging larger changes for now.
   bzip2_ = bzip2.override (args: { linkStatic = true; });