[packman] Please build ffmpeg with libwebp support

[Stanislav Baiduzhyi]

On Sunday 29 March 2015 23:58:55 you wrote:
> Sure,
> 
> wget 'http://www.808.dk/vstreamer.asp?video=gizmo.mp4'
> ffmpeg -i gizmo.mp4 gizmo.webp
> 
> On my system it says that there is no encoder for webp, which is easily
> fixed by rebuilding src.rpm with '--with libwebp' which I found in spec
> file.

It works now, huge thanx to Luigi and of course all of the packman team!

-- 
Regards,
    Stas