multimedia/wl-screenrec: Mark BROKEN with FFmpeg 8.1+

Fails to build,
non-exhaustive patterns: sys::AVColorPrimaries::AVCOL_PRI_EXT_BASE and sys::AVColorPrimaries::AVCOL_PRI_EXT_NB not covered

Port is also outdated and there's an open PR to support FFmpeg 8.0

Reference:
https://github.com/russelltg/wl-screenrec/pull/146

PR: 293872
Reported by: antoine via exp-run