Not the most recent version, because the latest requires
an new dependency (`bitarray`) we don't currently have.
(nothing really uses this one on-tree, so... no rush there)
* 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.
