Bug 1432779 - Rust vendor. r=jya

Cargo.lock

third_party/rust/cubeb-backend/.cargo-checksum.json

third_party/rust/cubeb-backend/Cargo.toml

third_party/rust/cubeb-backend/src/capi.rs

third_party/rust/cubeb-backend/src/ops.rs

third_party/rust/cubeb-backend/src/traits.rs

third_party/rust/cubeb-backend/tests/test_capi.rs

third_party/rust/cubeb-core/.cargo-checksum.json

third_party/rust/cubeb-core/Cargo.toml

third_party/rust/cubeb-core/src/builders.rs

third_party/rust/cubeb-core/src/channel.rs

third_party/rust/cubeb-core/src/context.rs

third_party/rust/cubeb-core/src/stream.rs

third_party/rust/cubeb-sys/.cargo-checksum.json

third_party/rust/cubeb-sys/Cargo.toml

third_party/rust/cubeb-sys/libcubeb/CMakeLists.txt

third_party/rust/cubeb-sys/libcubeb/include/cubeb/cubeb.h

...ust/cubeb-sys/libcubeb/src/android/cubeb-output-latency.h

...rust/cubeb-sys/libcubeb/src/android/cubeb_media_library.h

third_party/rust/cubeb-sys/libcubeb/src/cubeb-internal.h