shairport-sync: add drift and ALSA mixer config options #25922
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Allow setting drift_tolerance_in_seconds, which replaces the now-deprecated drift option.
Also allow setting alsa.mixer_control_index, which is necessary to use the hardware mixer correctly on some devices (like the Apple USB-C Headphone Adapter when a headset is plugged in).
Maintainer: @mikebrady @neheb @thess
Compile/run tested: ramips, Cudy TR1200 v1, OpenWrt 24.10-SNAPSHOT, r28242-1eff737906