warn user about crappy OS patch by (Steve Lhomme <steve.lhomme@free.fr>)

trailing whitespace and init=1 nonsense removed by me
AV_LOG_ERROR -> AV_LOG_INFO (yes steve even though many like you think its an error to use such a OS i cant apply that to cvs, sorry)

Originally committed as revision 5251 to svn://svn.ffmpeg.org/ffmpeg/trunk