multimedia/{mplayer|mencoder} Update to upstream snapshot 2026-04-04
This updates multimedia/mplayer and mencoder to an up-to-date
snapshot as of 2026-04-04.
- Due to upstream development slowing down, distfiles are now incremental diffs.
- This marks the JACK option broken for now due to ffmpeg API retirements.
PR: 292157
MFH: 2026Q2