build: put .PHONY directly before its target

Before this change, the .PHONY is followed by multiple targets.
Now it is multiple .PHONY for each target.

PR-URL: https://github.com/nodejs/node/pull/17964
Refs: https://github.com/nodejs/node/issues/16968


Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>