There's now an easy way to use the Android NDK with Rust!
Install the NDK somewhere, set NDK_HOME to the base of it. Use `rustup target install` to install an Android target, such as `armv7-linux-androideabi`.
Do `cargo install cargo-ndk`. Run in your project directory: `cargo ndk --target armv7-linux-androidebai --android-platform 16 build --release`.
Tada, you have a release build of a Rust library ready for linking on Android. :)