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

[Mark Dickinson]

Mark Dickinson added the comment:

> Updating dtoa.c would be a large and error-prone task.

It would also take us even further away from the upstream sources, making it harder to integrate bugfixes from upstream.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30124>
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