[Python-checkins] [python/cpython] b04412: Drop C++ header compatibility test (#718) (#719)

[GitHub]

  Branch: refs/heads/3.6
  Home:   https://github.com/python/cpython
  Commit: b044120f048571030552eefab8ba2329a9e76ceb
      https://github.com/python/cpython/commit/b044120f048571030552eefab8ba2329a9e76ceb
  Author: Brett Cannon <brettcannon at users.noreply.github.com>
  Date:   2017-03-19 (Sun, 19 Mar 2017)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Drop C++ header compatibility test (#718) (#719)

The $CXX environment variable is not exported under the 'c' language on Travis.
(cherry picked from commit 77ed11552da3e01dd235b7d68988076866b1f604)