Nothing uses this old package (no new releases since 2015) on-tree.
We might want to just drop this one next time (users will be able to
use it via `pip install` if they miss it).
* 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.
