portaudio: fix build for arm64-darwin
portaudio: fix build for arm64-darwin

Hydra failed to build portaudio against the MacOS SDK 11.0, see [1]. The
errors stem from the fact that certain functions in the SDK have been
marked as depricated. When building locally on my machine (which uses a
newer SDK version) there are no such errors. Therefore, until we get
 #101229 fixed we can ignore these deprication errors.

[1]: https://hydra.nixos.org/build/147771864/nixlog/1

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