cargo ndk-env does not export ANDROID_PLATFORM, ANDROID_ABI

[MabaKalox]

cargo ndk build, provides envs like: ANDROID_PLATFORM, ANDROID_ABI for build.rs, but cargo ndk-env does not.
Use case: rust-analyzer executes build.rs of crates, and if script depend on these envs, it would fail.

Ideally cargo ndk-env would provide 1 to 1 copy of env, which cargo.rs sets for cargo Command (maybe that is completely wrong approach).

[bbqsrc]

Thanks for the feedback.

I would accept a pull request that corrects this behaviour.