Log Message:
Update libopus to 1.1.2:

Opus 1.1.2 includes:

    Fixes encoder or decoder state reset, which would previously
    disable some run-time selected architecture-specific optimizations;
    and
    Fixes hybrid mode discontinuous transmission (DTX) operation,
    where the comfort noise above 8 kHz was incorrectly estimated
    and could oscillate in time.

None of these bugs were regressions over previous releases.