Pull request: Raise SIGFPE instead of abort in __gmp_exception`

[Torbjörn Granlund]

nisse at lysator.liu.se (Niels Möller) writes:

  > Hmm. What about `#ifdef` on `SIGFPE` and `abort` otherwise. This
  > should be a sane enough default for the even when the custom handler
  > is added.
  
  Sounds good enough. If noone objects, I'll make a patch to do that and
  try the patch approval procedure at work.
  
No system uses enums for these?

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Torbjörn
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