Remove "remove OCLint" workaround

Since https://github.com/travis-ci/travis-build/commit/52c6b6cc1d537e52c8ae6f0906944d6fcaa3d173, it's no longer needed

library_builders.sh

@@ -92,8 +92,6 @@ function build_github {
 function build_openblas {
     if [ -e openblas-stamp ]; then return; fi
     if [ -n "$IS_OSX" ]; then
-        # https://github.com/travis-ci/travis-ci/issues/8826
-        brew cask uninstall oclint || echo "no oclint"
         brew install openblas
         brew link --force openblas
     else

travis_osx_steps.sh

@@ -18,8 +18,6 @@ source $MULTIBUILD_DIR/library_builders.sh
 # config.sh can override any function defined here.
 
 function before_install {
-    # Uninstall oclint. See Travis-CI gh-8826
-    brew cask uninstall oclint || true    
     export CC=clang
     export CXX=clang++
     get_macpython_environment $MB_PYTHON_VERSION venv