[FFmpeg-cvslog] lavfi/curves: add presets support.

[Lou Logan]

On Mon, Mar 25, 2013, at 02:51 PM, Clément Bœsch wrote:
> ffmpeg | branch: master | Clément Bœsch <ubitux at gmail.com> | Mon Mar 25
> 01:19:17 2013 +0100| [dc65d784df4071b772d6f6967fa79767d6ad4fae] |
> committer: Clément Bœsch
> 
> lavfi/curves: add presets support.

I just realized that "strong_contrast" preset is missing. The values are
in my patch.