stdenvLinux: Remove bootstrapTools from closure

The "expand-response-params" program had an unnecessary reference to
bootstrapTools, bloating the closure from 205 to 314 MiB.

pkgs/build-support/cc-wrapper/default.nix

@@ -130,6 +130,8 @@ let
       # Work around "stdenv-darwin-boot-2 is not allowed to refer to path /nix/store/...-expand-response-params.c"
       cp "$src" expand-response-params.c
       "$CC" -std=c99 -O3 -o "$out" expand-response-params.c
+      strip -S $out
+      ${optionalString hostPlatform.isLinux "patchelf --shrink-rpath $out"}
     '';
   } else "";