extensions are added to the end of the struct (avoids build issues on 64 bits platform)
add osd extension to be used by mplayer (required by the resent changes in the build system)
breaking the compability, thus bumping minor lavc version number


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@8527 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b