msvcrt: Fix EOF behavior on read from pipe or console (take 2)

[Dan Kegel]

The canonical way to detect EOF on read is when
you request more than zero bytes, but zero bytes
come back.  Switching to this method seems to
handle a few problem cases better.
Also handle ERROR_BROKEN_PIPE properly just in case.

Thanks to Damjan Jovanovic for feedback and testing,
and Nguyễn Thái Ngọc Duy for the nudge.

Should fix http://bugs.winehq.org/show_bug.cgi?id=11187
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