avcodec/mjpegenc_common: Restore removed copyright statements

These where removed by  libav while spliting the file in adcb8392c9b185fd8a91a95fa256d15ab1432a30

See: de6d9b6404bfd1c589799142da5a95428f146edd
See: 723106b279d9d78f5966f32bedfa33b88a702f69

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
swresample: split option table to a separate file

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>