[issue30124] Fix C aliasing issue in Python/dtoa.c to use strict aliasing on Clang 4.0

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Could we use Clang specific pragma in dtoa.c rather than a compiler option?

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue30124>
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