[Python-Dev] Issue #10348: concurrent.futures doesn't work on BSD

["Martin v. Löwis"]

> And, again, the threading-based API in concurrent.futures should work
> fine anyway. Do you suggest we selectively disable the process-based
> API?

Yes. Importing concurrent.futures.process should fail. Unfortunately,
it's imported from __init__.py, so either we change the API to move
the executors to the submodules, or we let creation of process pools
fail (rather than the import).

Regards,
Martin