audio/pipewire-spa-oss-ng: Update to 0.9.9

Improve playback timing and OSS event handling: avoid locked polling on
audio cycles, use enriched kqueue events for wakeups (with an optional
timer-based path), retain partial writes, retune without inserting
silence, and keep queued playback across Pause.

Generate format-correct PCM silence and harden host input and reentrant
event handling on the device and node paths.