Show build warnings in code_layout test

Author: m-kuhn

.ci/travis/code_layout/script.sh

@@ -20,6 +20,6 @@ pushd build
 export CTEST_BUILD_DIR=${TRAVIS_BUILD_DIR}
 export CTEST_BUILD_COMMAND="/usr/bin/make -j3 -i -k"
 
-python3 "${TRAVIS_BUILD_DIR}/.ci/travis/scripts/ctest2travis.py" xvfb-run ctest -V --output-on-failure -S "${TRAVIS_BUILD_DIR}/.ci/travis/travis.ctest"
+python3 "${TRAVIS_BUILD_DIR}/.ci/travis/scripts/ctest2travis.py" xvfb-run ctest -VV --output-on-failure -S "${TRAVIS_BUILD_DIR}/.ci/travis/travis.ctest"
 
 popd