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

[STINNER Victor]

STINNER Victor added the comment:

> I'd strongly prefer not to modify dtoa.c here unless we really have to.

See the clang bug report:
https://bugs.llvm.org//show_bug.cgi?id=31928

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