[issue17837] Support for building on ppc64p7

[David Edelsohn]

David Edelsohn added the comment:

If I understand correctly, config.sub is imported from upstream FSF project.  I do not know how much CPython diverges from the upstream file and merges in local changes.

I'm still a little confused about what this patch accomplishes.  One can configure with CC or CFLAGS set for POWER7.  And one can test for processor feature support macros in the code.

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