[BUG] gradlew clean doesn't remove JNI artifacts

[sam-herman]

What is the bug?
./gradlew clean is a standard task that is supposed to allow for subsequent builds to have a clean idempotent start.
At the moment all the JNI artifacts from previous builds remain and pollute the builds.
This is making it hard to reproduce locally when something breaks on the remote build and vice versa. For example:
#2442 (comment)

How can one reproduce the bug?
Steps to reproduce the behavior:

1. ./gradlew clean; ./gradlew build
2. pull new code
3. ./gradlew clean; ./gradlew build
4. Will result in unexpected behavior see fix broken build flag, move build to one directory #2442 (comment)

What is the expected behavior?
After this change the expected behavior should make sure we have no left over build artifacts for JNI and they will all build from scratch

[sam-herman]

Please assign to me( @sam-herman ) I have a PR already submitted for this:
#2516