This commit replaces a fprintf() with a call to
ProcessEmitWarning().
Refs: https://github.com/nodejs/node/issues/12706
PR-URL: https://github.com/nodejs/node/pull/12709
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>