[issue7715] Allow use of GNU arch on Darwin

[Ned Deily]

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

BTW, I believe there is a problem with ARCH_RUN_32BIT as it stands: as far as I can tell, unlike lipo, /usr/bin/arch requires -ppc and rejects -ppc7400 regardless if the executable is -arch ppc7400 or -arch ppc.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7715>
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