Don't barf if the g++ version string doesn't parse correctly

[jwiggins]

Fixes #220

[rkern]

LGTM pending CI.

[codecov-io]

Current coverage is 35.35%

Merging #226 into master will not change coverage

@@             master       #226   diff @@
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  Files           211        211          
  Lines         18659      18659          
  Methods           0          0          
  Messages          0          0          
  Branches       2621       2621          
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  Hits           6596       6596          
  Misses        11543      11543          
  Partials        520        520          

1. File ...ble/qt4/constants.py (not in diff) was modified. more

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[jwiggins]

Thanks for looking @rkern. What about the codecov checks? Still ignoring those?

[corranwebster]

I think we should ignore codecov checks for now - they've messed around with their infrastructure and until we have time to update we shouldn't worry too much about it.

[jwiggins]

In that case, I'm merging