Rust bindings to the Android NDK

See these ndk-examples and these rust-android-examples for examples using the NDK.

[!IMPORTANT] This repository was recently modularized and the following crates were split into separate repositories:

Crate	New Location	Notes
ndk-context	https://github.com/rust-mobile/ndk-context
ndk-glue	https://github.com/rust-mobile/ndk-glue	⛔ deprecated - see android-activity
ndk-macro	https://github.com/rust-mobile/ndk-glue	⛔ deprecated - see android-activity
ndk-build	https://github.com/rust-mobile/cargo-apk	⛔ deprecated - see xbuild
cargo-apk	https://github.com/rust-mobile/cargo-apk	⛔ deprecated - see xbuild