Add a feature for MacOS' IOKit/audio/IOAudioTypes.h (#92) #113

Job	Run time
macos-test (stable)	1m 55s
macos-docs	2m 1s
cargo-publish	1m 23s
macos-test (nightly)	4m 32s
ios-check (stable, aarch64-apple-ios)	3m 5s
ios-check (stable, x86_64-apple-ios)	2m 32s
ios-check (stable, aarch64-apple-ios-sim)	2m 50s
ios-check (nightly, aarch64-apple-ios)	2m 18s
ios-check (nightly, x86_64-apple-ios)	3m 51s
ios-check (nightly, aarch64-apple-ios-sim)	1m 46s
	26m 13s

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