Add libffi7 for python 3.8 support

[Himel55]

The zephyr test runner twister fails because the ctypes dependency requires libffi7 when using python 3.8 (the version of python installed by the toolchain manager).

[coderbyheart]

Please add a test that shows that the change fixes the problem.

[Himel55]

Updated with a test. This is what I was getting before the change:

[Himel55]

not sure why but the CI seems to be failing on the downloading of the toolchain bundle

[coderbyheart]

Yeah, this regularly happens.

[Himel55]

Is it possible to re-run a variant?

[coderbyheart]

Rerunning them now.

[coderbyheart]

Thank you!

[Himel55]

Thanks!

[coderbyheart]

@Himel55 the most recent version of Twister no longer works. Do you have an idea how to fix this?

[Himel55]

Looks like the match statement was used in one of the twister library files which isn't supported in python 3.8. This has been fixed upstream by zephyr here - (zephyrproject-rtos/zephyr@4cc3134)

But the nordic fork of zephyr doesn't include this change yet - https://github.com/nrfconnect/sdk-zephyr/commits/main/scripts/pylib/twister/twisterlib/statuses.py

[coderbyheart]

Ah cool, thanks for the info ... we'll just wait then.