[packman] FFMPEG Vulkan support

[Daniel Molkentin]

Hi,

On 2021-05-19 10:50, idesmi at protonmail.com wrote:
> I have been trying to use the filter `scale_vulkan` without success,
> to discover that ffmpeg distributed in the Packman repos does not come
> with Vulkan support enabled in build.
> Could you please add it? It's been available since version 4.3, and
> we're now at 4.4

Good catch, I am adding this rn. However, This needs submission to OBS, 
then trickle down to PBMS (which should be instant once the submission 
is accepted in OBS IIRC).

Cheers,
   Daniel