[Commits] [wesnoth/wesnoth] c18c46: Travis: Install OSX dependencies

[GitHub]

  Branch: refs/heads/travis_osx
  Home:   https://github.com/wesnoth/wesnoth
  Commit: c18c46da5924747c242157a3fd4389eaa2d9330e
      https://github.com/wesnoth/wesnoth/commit/c18c46da5924747c242157a3fd4389eaa2d9330e
  Author: Celtic Minstrel <celtic.minstrel.ca at some.place>
  Date:   2016-11-11 (Fri, 11 Nov 2016)

  Changed paths:
    M .travis.yml
    M utils/travis/install_deps.sh

  Log Message:
  -----------
  Travis: Install OSX dependencies

Also restrict environment and compiler for OSX build