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2d22e3fe - Drop PPC64 (big endian) builds (#17626)

Drop PPC64 (big endian) builds (#17626) PPC64 (big endian) seems dead, and it's only supported on one exact manylinux version (https://github.com/pypa/auditwheel/issues/669), so we should drop it. This change does not affect PPC64LE (little endian).