Update the source

[Xiadalei]

It seems that you can use “ndk-bundle” in the sdk manager to get NDK instead of fetching it manually.

Also the support library is in the google maven now which means you won't need to get it from sdk manager.

[williamchong]

It seems that only the latest version of ndk-bundle is available in the sdkmanager,
It also has complicated version number (eg 17.0.4754217), instead of the clean naming schema (e.g. 17, 17b, 17c) used for the zip and change log
https://developer.android.com/ndk/downloads/revision_history

so for easier maintenance and version control, I would prefer sticking with zips for now.

For the support library part, I don't think we are downloading the actual library, but the extras;google;m2repository might actually be unnecessary now. Might try getting rid of it later when I have time.