media-video/ffmpeg-4.4.4-r3 won't compile with clang and lld

[Goverp]

My weekly update wanted to recompile ffmpeg-4.4.4-r3, but it failed under clang & lld.
The build log had a message about needing "-fPIC", but adding that changed nothing.

The same ffmpeg compiled happily back in August, and clang hasn't been updated since July; what has changed is that I was using the mold-2.1.0 linker, but I reverted back to lld after having segfaults with mold-2.2.0.

Compiling with gcc worked, so I added ffmpeg to my list of gcc-only packages.
I've just tried with clang and mold-2.1.0, and that's happy. Weird!
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Greybeard