Travis: Update gcc to 4.7
authorDaniel Albers <daniel@lbe.rs>
Mon, 28 Jul 2014 14:29:37 +0000 (16:29 +0200)
committerDaniel Albers <daniel@lbe.rs>
Mon, 28 Jul 2014 20:06:51 +0000 (22:06 +0200)
Fixes Travis builds currently failing with:
  cc1plus: error: unrecognized command line option ‘-std=c++11’


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