atom build fail

[RobertFlatt]

Checklist

• [x ] the issue is indeed a bug and not a support request
• [x ] issue doesn't already exist: https://github.com/kivy/python-for-android/issues
• I have a short, runnable example that reproduces the issue
• [x ] I reproduced the problem with the latest development version (p4a.branch = develop)
• [x ] I used the grave accent (aka backticks) to format code or logs when appropriated

Logs

[INFO]:    Building atom for arm64-v8a
[INFO]:    atom apparently isn't already in site-packages
[INFO]:    Building compiled components in atom
[INFO]:    -> directory context /home/bobf/ex/rtest/.buildozer/android/platform/build-arm64-v8a/build/other_builds/atom/arm64-v8a__ndk_target_21/atom
[DEBUG]:   -> running python3 setup.py build_ext -v
[DEBUG]:        Traceback (most recent call last):
[DEBUG]:          File "/home/bobf/ex/rtest/.buildozer/android/platform/build-arm64-v8a/build/other_builds/atom/arm64-v8a__ndk_target_21/atom/setup.py", line 13, in <module>
[DEBUG]:            from cppy import CppyBuildExt
[DEBUG]:        ModuleNotFoundError: No module named 'cppy'