Do not write an extra byte in the iTunes 'hdlr' tag. The files on iTMS have an

Do not write an extra byte in the iTunes 'hdlr' tag.  The files on iTMS have an
extra byte and are not compliant with ISO 14496-12.  This causes some strict
demuxers (notably the MPEG-4 ALS reference software) to fail.  It has been
confirmed that not writing the extra byte will still allow the generated MP4
files to work with QuickTime/iTunes/iPod.

Originally committed as revision 20571 to svn://svn.ffmpeg.org/ffmpeg/trunk