Android support

[simlay]

See
Follow:

• https://dushistov.github.io/flapigen-rs/java-android-example.html
• https://github.com/Dushistov/flapigen-rs/tree/master/android-example

Probably requires changes to https://github.com/infinyon/future-aio

[sehz]

what changes are need for future-aio?