rl.h: remove deprecated and now unused vlc member.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
rl.h: Use on-stack temporary VLC tables instead of having them static.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
rangecoder-test: Allow running with small stack size.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
vf_deshake: reduce stack usage.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
vf_deshake: Avoid doing a malloc+free for every single frame.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>