[3.9] bpo-45405: Prevent ``internal configure error`` when running...

[3.9] bpo-45405: Prevent ``internal configure error`` when running ``configure``  with recent versions of non-Apple clang. (GH-28845) (GH-28910)



Change the configure logic to function properly on macOS when the compiler
outputs a platform triplet for option --print-multiarch.

Co-authored-by: Ned Deily <nad@python.org>
(cherry picked from commit 9c476677)


Co-authored-by: David Bohman <debohman@gmail.com>

Automerge-Triggered-By: GH:ned-deily