The presence of HaikuPorter's work git repo interferes with the
operation of some python packages used at build time, causing
builds with "hp -G" to succeed, but fail without that flag, unless
these work-arounds are applied:
- exporting a `SETUPTOOLS_SCM_PRETEND_VERSION` variable
- `rm -rf dist`
* 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.
