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alsa-plugins: add more dependencies, make existing dependencies unconditional
Add ffmpeg for a52 plugin, speexdsp for rate_speex plugin. Don't add libsamplerate (speexdsp is generally a better resampler), libavtp (not packaged currently, very niche). The current dependency handling is a weird hack, we don't need to do it, even if people override it to null it will be ignored.