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

[Stefan Krah]

Stefan Krah added the comment:

Regarding volatile: gcc/clang seem to honor *some* changes to
the control word. At least in libmpdec both compilers have
always left the settings 80bit-prec/ROUND_CHOP intact, even
though it's not the default.

Let's rewrite Python in asm to avoid these issues. :)

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