avcodec/pafvideo: remove unused header

Signed-off-by: Paul B Mahol <onemda@gmail.com>
avcodec/pafaudio: use paf.h instead

Signed-off-by: Paul B Mahol <onemda@gmail.com>
gdigrab: fix gdi object leak if using mouse

based on patch from hlszl1983@163.com

Signed-off-by: rogerdpack <rogerpack2005@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>