glog: use os.Stderr directly for writing to stderr #62
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This was raised in https://groups.google.com/g/golang-nuts/c/o85vycfiGVY/m/MblpnfF6BQAJ.
Before the 1.1.0 release it was possible to set os.Stderr to a different *os.File (like an os.Pipe) to capture output that is written to stderr. Restore that behavior.