add the long_name to the -formats output patch by (john Galloway <jrg at...

add the long_name to the -formats output patch by (john Galloway <jrg at monsterbot dot com>) and (Måns Rullgård <mru at mru dot ath dot cx>)

Originally committed as revision 3611 to svn://svn.ffmpeg.org/ffmpeg/trunk