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If we eventually want to support all the shadow passwort
APIs, we should make this a separate module - with that
approach, building spwd can might fail without causing a
failure to compile pwd.

Unfortunately, the patch is still incomplete: there is no
change to setup.py, and no documentation change. Are there
any volunteers interesting in completing it? If not, I'm
going to close it again. Anybody hunting for such a module
will still be able to find it.