The `$(RM) {foo,bar,baz}` rules don't seem to work with GNU make 4.1.
Write them out in full and get rid of a few overlong lines in the
process.

PR-URL: https://github.com/nodejs/node/pull/18332


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Jon Moss <me@jonathanmoss.me>