Re: libpq debug log

So drongo is still failing, and after a bit of looking around at
other code I finally got hit with the clue hammer.  Per port.h:

 * On Windows, setvbuf() does not support _IOLBF mode, and interprets that
 * as _IOFBF.  To add insult to injury, setvbuf(file, NULL, _IOFBF, 0)
 * crashes outright if "parameter validation" is enabled.  Therefore, in
 * places where we'd like to select line-buffered mode, we fall back to
 * unbuffered mode instead on Windows.  Always use PG_IOLBF not _IOLBF
 * directly in order to implement this behavior.

You want to do the honors?  And do something about that shift bug
while at it.

            regards, tom lane