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setvbuf(stdout, NULL, _IOLBF, 0) so interactive completion messages like "Done -> ..." reach piped clients immediately (antirez#25).
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Summary
Done -> ...completion lines flush immediately when stdout is a pipe (non-TTY).Fixes #25
Test plan
make -j && ./h3_testsDone ->appears after FFmpeg completes (repro from Bug: Interactive session doesn't emit 'Done ->' line when stdout is a pipe (non-TTY) #25)