[issue8100] `configure` incorrectly handles empty OPT variable

[Arfrever Frehtes Taifersar Arahesis]

Arfrever Frehtes Taifersar Arahesis <Arfrever.FTA at GMail.Com> added the comment:

Could you apply this patch also in 3.1 branch?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8100>
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