git-svn: print and flush authentication prompts to STDERR
People that redirect STDOUT output should always see STDERR prompts interactively. STDERR should always be flushed without buffering, so they should always show up. If that is unset, we still explicitly flush by calling STDERR->flush. The svn command-line client prompts to STDERR, too. Signed-off-by: NEric Wong <normalperson@yhbt.net> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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