* [opusfile] Bump to 9d71834.
This was recommended to fix dependency issues in sdl2-mixer. See
https://github.com/microsoft/vcpkg/pull/29487#discussion_r1103658181
This commit brings first-party CMake support and minor fixes with no API
change.
* [opusfile] Disable opusurl on Windows.
Fixes#29582.
* [opusfile] Update baseline.
* [opusfile] Update ambiguous comment in usage file.
* [opusfile] Update version.
