[webrtc-insertable-streams] Pull Request: Detect missing references on build

dontcallmedom has just submitted a new pull request for https://github.com/w3c/webrtc-insertable-streams:

== Detect missing references on build ==
Using spec-prod configuration to detect when the spec uses undefined references https://github.com/w3c/spec-prod/blob/main/docs/options.md#build_fail_on
Per https://github.com/w3c/webrtc-insertable-streams/pull/73#issuecomment-792653932

See https://github.com/w3c/webrtc-insertable-streams/pull/74


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