[packman] ffmpeg-8 built without AMF support

[Enrico Belleri]

AMF hardware acceleration support is not enabled in ffmpeg-8 build.
It is found in the spec file as `%bcond_without amf_sdk`, but it seems 
to be disabled at project level in `Essentials`.
It used to be enabled in the past.
There has been a report from another user too, who also relied on this 
hardware acceleration method; their message remained unanswered:

Mon Oct 27 18:02:47 CET 2025, Sasha Beam (sashabeam23 at gmail.com)
 > [packman] [PM] ffmpeg-8 8.0-1699.3.pm.4 (openSUSE Tumbleweed/x86_64)
 > Hello,
 >
 > What happened to AMF (Advanced Media Framework, AMD GPU video encoding)
 > support in ffmpeg-8? ffmpeg-7 packages have it, but in ffmpeg-8 it is no
 > longer available.
 >
 > Previously I was able to (and regularly) used the various *_amf
 > encoders, but I am unable to now. I use them because they offer much
 > more control over the equivalent *_vulkan or *_vaapi encoders.
 >
 > Thanks.

There has been so far no explanation for disabling this configure flag.
Please re-enable it.
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