Brings in the AVFoundation audio output's bounded PCM lookahead, which
is compiled in on macOS only. AVSampleBufferAudioRenderer holds roughly
1.7s of audio there, and mpv multiplies --volume into the samples as it
hands them over, so a volume change stayed inaudible until that backlog
drained. The bound cuts the queue to about 450ms, measured; tvOS and
iOS preprocess to the source they had before the patch, so the deep
buffering their AirPlay path relies on is untouched.
Also carries the Dolby-conformant compressed EAC3 sink from 1.0.15.
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