Upgrade libopus to d633f523e36e3b6d01cc6d57386458d770d618be am: fe30a3c3a7

Original change: https://android-review.googlesource.com/c/platform/external/libopus/+/1577285

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I684b721475cd5c6ff5ed1c26426567b8a436f18f