lavfi/split: use AVFILTER_DEFINE_CLASS to define class
lavfi/aspect: fix weird copyright notice
doc/filters: fix sentence in setsar/setdar docs
lavc: avcodec_open2(): pass context to av_log()

Signed-off-by: Paul B Mahol <onemda@gmail.com>
sgirledec: remove unused headers

Signed-off-by: Paul B Mahol <onemda@gmail.com>
lavfi/stereo3d: remove pointless store

Signed-off-by: Paul B Mahol <onemda@gmail.com>
libaacpluc: remove unused code

Signed-off-by: Paul B Mahol <onemda@gmail.com>