fix bug skipping ahead in stdin on windows (SF#1776803: https://sourceforge.net/tracker/index.php?func=detail&aid=1776803&group_id=13478&atid=113478)
fix bug skipping ahead in stdin on windows (SF#1776803: https://sourceforge.net/tracker/index.php?func=detail&aid=1776803&group_id=13478&atid=113478)

jeeb/flac,jeeb/flac,jeeb/flac,jeeb/flac