whisper.cpp: enable Vulkan, SDL2 and ffmpeg

Groundwork for a local voice assistant. SDL2 adds the microphone
tools: whisper-stream for live transcription, whisper-command for
voice commands, plus whisper-talk-llama and whisper-lsp. ffmpeg lets
the tools decode any audio format ffmpeg reads, not only the WAV, MP3
and FLAC that the bundled miniaudio handles. Vulkan runs the whole
model on the GPU; OpenVINO still covers the encoder when a converted
encoder model is present.

All three come from the -current base, so REQUIRES is unchanged.
Test-built on -current, sbopkglint clean.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

0 files changed, 0 insertions, 0 deletions