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fee6c0a683
run_make_support: rename `Command::stdin` to `stdin_buf` and add `std{in,out,err}` config helpers
Previously `Command::stdin` was actually just a stdin buffer helper, but
this is different from `std::process::Command::stdin`. This is
needlessly confusing, and blocks support to add `std{in,out,err}` config
helpers that tests may want to use to e.g. redirect to `/dev/ptmx`.