cpal

Fixed WASAPI memory leak #923

Job	Run time
android-apk-build	1m 30s
asmjs-wasm32-test (wasm32-unknown-emscripten)	52s
cargo-publish	0s
android-check	38s
clippy-test	45s
ios-build	2m 14s
linux-check-and-test-armv7	1m 37s
macos-test	1m 31s
rustfmt-check	7s
ubuntu-test	51s
wasm32-bindgen-test (wasm32-unknown-unknown)	21s
wasm32-wasi-test (wasm32-wasi)	13s
wasm-beep-build	32s
windows-test (x86_64)	3m 14s
windows-test (i686)	3m 4s
	17m 29s

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