Use built in cmake

.travis.yml

@@ -136,11 +136,11 @@ before_install:
       brew install -y https://raw.githubusercontent.com/Homebrew/homebrew-core/5b680fb58fedfb00cd07a7f69f5a621bb9240f3b/Formula/doxygen.rb;
       sudo pip install -U pytest --ignore-installed six;
     fi
-  - if [[ "${TRAVIS_OS_NAME}" == "linux" ]]; then
-      CMAKE_URL="http://cmake.org/files/v3.7/cmake-3.7.2-Linux-x86_64.tar.gz";
-      mkdir $HOME/cmake && travis_retry wget --no-check-certificate --quiet -O - ${CMAKE_URL} | tar --strip-components=1 -xz -C $HOME/cmake;
-      export PATH=${HOME}/cmake/bin:${PATH};
-    fi
+  #- if [[ "${TRAVIS_OS_NAME}" == "linux" ]]; then
+  #    CMAKE_URL="http://cmake.org/files/v3.7/cmake-3.7.2-Linux-x86_64.tar.gz";
+  #    mkdir $HOME/cmake && travis_retry wget --no-check-certificate --quiet -O - ${CMAKE_URL} | tar --strip-components=1 -xz -C $HOME/cmake;
+  #    export PATH=${HOME}/cmake/bin:${PATH};
+  #  fi
   - if [[ "$OPENCL" == "true" ]]; then
       wget http://s3.amazonaws.com/omnia-ci/AMD-APP-SDKInstaller-v3.0.130.135-GA-linux64.tar.bz2;
       tar -xjf AMD-APP-SDK*.tar.bz2;