[issue30910] Add -fexception to ppc64le build

[Antoine Pitrou]

Antoine Pitrou added the comment:

Several comments:
- we don't want to risk bugfix branches for this, so this should only go into the master branch (future 3.7)
- I'm not sure it's a reasonable policy to fix shortcomings of all compilers in our configure script; though of course we already have such code for common setups
- regarding the PR, OPT does not look like the right variable to use (it's not an optimization setting)

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components: +Build
type:  -> enhancement
versions: +Python 3.7 -Python 2.7

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<http://bugs.python.org/issue30910>
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