[issue20904] HAVE_PY_SET_53BIT_PRECISION for m68k

[Mark Dickinson]

Mark Dickinson added the comment:

> Since you say the non-short-float code is legacy this will make it also possible to drop it.

That's unfortunately not true (much as I'd like it to be).  Even with this patch, there may still be non-gcc / x86 combinations where we potentially need the fallback code.

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<http://bugs.python.org/issue20904>
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