mk: Add a printer helper to the make setup #24315
Merged
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Also add docs because not being able to discover these things is the pits.
This was lifted from http://blog.jgc.org/2015/04/the-one-line-you-should-add-to-every.html , and solves a problem I've solved myself a lot of times, often in massively inferior ways.
Super open to documenting it somewhere other than nitty-gritty, which isn't immediately obvious.