cpal

Prepare 0.15.3 release #833

Job	Run time
android-check	34s
android-apk-build	1m 47s
asmjs-wasm32-test (wasm32-unknown-emscripten)	52s
cargo-publish	0s
clippy-test	45s
ios-build	2m 54s
linux-check-and-test-armv7	1m 35s
macos-test	1m 36s
rustfmt-check	7s
ubuntu-test	43s
wasm32-bindgen-test (wasm32-unknown-unknown)	26s
wasm32-wasi-test (wasm32-wasi)	23s
wasm-beep-build	26s
windows-test (x86_64)	2m 46s
windows-test (i686)	2m 47s
	17m 41s

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