build runner: print to stderr in dumb terminals

Terminal progress is suppressed and instead there is an explicit
handling of printing to stderr, one line per step make() function call.
The output looks very similar to Ninja.

A future commit should add a -q to quiet the output.
7d5bce56e1Andrew Kelley committed on 3/15/2023, 5:48:14 PMparent097bcca
1 file changedLine totals unavailable