On-tree recipes that depend on cffi:
- argon2_cffi_bindings
- bcrypt
- pycares
- pynacl
So we're doing the same on those too in one go.
Also:
- moved all recipes to use build/installer instead of setup.py.
- fixed calling of tests on cffi.
* python3.8: bulk removal of now obsolete "_python38" packages.
Done via scripting. No functional change intended or expected.
Some manual tweaks will follow.
* python3.8: further manual tweaks after bulk-3.8-removal.
Unlike the previous commit with automated changes,
I've tested builds for *these* recipes in beta4 64 bits.
