Vendor dependencies for 0.3.0 release

vendor/cc/README.md

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+# cc-rs
+
+A library for [Cargo build scripts](https://doc.rust-lang.org/cargo/reference/build-scripts.html)
+to compile a set of C/C++/assembly/CUDA files into a static archive for Cargo
+to link into the crate being built. This crate does not compile code itself;
+it calls out to the default compiler for the platform. This crate will
+automatically detect situations such as cross compilation and
+various environment variables and will build code appropriately.
+
+Refer to the [documentation](https://docs.rs/cc) for detailed usage instructions.
+
+## License
+
+This project is licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+   https://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+   https://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in cc-rs by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.