[issue7715] Allow use of GNU arch on Darwin

[Ned Deily]

Ned Deily <nad at acm.org> added the comment:

Note that with current trunk and in-the-pipeline proposed changes, configure is depending on using the Apple-supplied enhanced version of arch on 10.5+ (e.g. to force execution in 32-bit mode) so, while the patch here doesn't harm anything, it points to another potential problem: configure should probably ensure it *is* using the Apple arch.

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nosy: +ned.deily

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