buildStackProject: Set __noChroot to make it fail without sandbox

Building such a derivation will result in

  error: derivation '/nix/store/nk4wms3hk4mp9lc86k30vc8w44fcq0rj-foo.drv' has '__noChroot' set, but that's not allowed when 'sandbox' is 'true'

when attempting to build it without --option sandbox false

pkgs/development/haskell-modules/generic-stack-builder.nix

@@ -20,6 +20,10 @@ let
 
 in stdenv.mkDerivation (args // {
 
+  # Doesn't work in the sandbox. Pass `--option sandbox relaxed` or
+  # `--option sandbox false` to be able to build this
+  __noChroot = true;
+
   buildInputs = buildInputs
     ++ lib.optional (stdenv.hostPlatform.libc == "glibc") glibcLocales;