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

[Mark Dickinson]

Mark Dickinson added the comment:

> (I would prefer to keep -fstrict-aliasing).

Updating dtoa.c would be a large and error-prone task. It may be simpler to adjust the buildsystem so that we can specify -fno-strict-aliasing just for dtoa.c.

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