Revert "Travis CI: Install any g++ version available"
Revert "Travis CI: Install any g++ version available"

This reverts commit 9e50f921ad1899e8a4c7816880f75c9d8294f63d.

onddo/node-jmx,zuazo/node-jmx,onddo/node-jmx,zuazo/node-jmx