[issue24520] Stop using deprecated floating-point environment functions on FreeBSD

[STINNER Victor]

STINNER Victor added the comment:

"I expect the man page mentions it because it is mentioned in the standard. In the bugs section it does say the pragma is unimplemented."

Ah ah, funnny. Sorry, I was confused by the manual page.

I pushed your patch to Python 2.7, 3.5 and default (3.6) branches.

@koobs: sorry, 3.4 now only accept security fixes :-p

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<http://bugs.python.org/issue24520>
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