Win32: use Wide Chars APIs
libmp4: rewind stream before falling back to avformat

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
check_headers: UNICODE is not a private define
audioqueue: no need to compile packet.c anymore
AudioQueue: implemented TimeGet
waveout: packet.c is no longer needed
Merge branch 'master' of git://git.videolan.org/vlc into vaapi