make ninja scons daemon scripts output to stderr as well as logfile. #4146
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I noticed in appveyor run in #4144, intermittentally the ninja tests will fail. Unfortunately the ninja daemon prints most of its info to a logfile and not stderr, so when looking at the logs in the CI its hard to see what went wrong.
This PR puts the error message to stderr as well as the logs.
Contributor Checklist:
CHANGES.txt(and read theREADME.rst)