Travis: Don't install newer CMake version

.travis.yml

@@ -6,18 +6,6 @@ compiler:
   - gcc
   - clang
 install:
-  ############################################################################
-  # Install a recent CMake (unless already installed on OS X)
-  # See http://stackoverflow.com/questions/33196136/travis-ci-update-cmake-using-the-packages-cache
-  ############################################################################
-  - |
-    if [[ "${TRAVIS_OS_NAME}" == "linux" ]]; then
-      CMAKE_URL="http://www.cmake.org/files/v3.5/cmake-3.5.2-Linux-x86_64.tar.gz"
-      mkdir cmake && travis_retry wget --no-check-certificate --quiet -O - ${CMAKE_URL} | tar --strip-components=1 -xz -C cmake
-      export PATH=${DEPS_DIR}/cmake/bin:${PATH}
-    else
-      if ! brew ls --version cmake &>/dev/null; then brew install cmake; fi
-    fi
   - make install_deps
   - source setup.bash
 script: