Fix hang in toBuffer when spawned process writes a lot of data to stderr. #587
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In cases where stderr streams a lot of diagnostic, the process would block waiting for stderr buffer flush. We saw this occur with a PDF (ghostscript logging warnings).
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In cases where stderr streams a lot of diagnostic, the process
would block waiting for stderr buffer flush,
consequently toBuffer would never call back.
We saw this occur with a PDF (ghostscript warnings sent to stderr).