make help does not output hack/tools targets anymore

[chrischdi]

What steps did you take and what happened:

Executed make help

What did you expect to happen:

Expected the output to show the hack/tools target, but there is no output below hack/tools:

$ make
...
  clean-release-git                              Restores the git files usually modified during a release
  clean-generated-conversions                    Remove files generated by conversion-gen from the mentioned dirs. Example SRC_DIRS="./api/v1alpha4"

hack/tools:

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Did break via #5741

Environment:

• Cluster-api version: master
• Minikube/KIND version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):

/kind bug
[One or more /area label. See https://github.com/kubernetes-sigs/cluster-api/labels?q=area for the list of labels]