Travis CI: Install GCC 4.8 as well

.travis.yml

@@ -7,7 +7,7 @@ compiler: gcc
 before_script:
   - sudo add-apt-repository --yes ppa:ubuntu-toolchain-r/test
   - sudo apt-get update -qq
-  - sudo apt-get install -qq g++-4.8 libstdc++-4.8-dev
+  - sudo apt-get install -qq gcc-4.8 g++-4.8 libstdc++-4.8-dev
 # Travis specific tools
   - sudo apt-get install s3cmd grep zip mailutils
 # General toolchain dependencies