runCommand/waitForProcess don't respect text printing order whenstdout is redirected

[Johannes Waldmann]

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>>  hSetBuffering stdout LineBuffering

I run into this from time to time as well.
I think the ghc (runtime) runtime behaviour is confusing here,
as it tries to be too clever. I don't think it should
even try to find out whether it's writing to terminal or file.

Best regards, J.W.
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