OpenMPI: build with --with-libevent=internal - needed for MacOS
This is needed because older versions of OpenMPI fail on Mac with latest OS and Xcode
This will also be needed for the new release or it won't work generically on the Mac.
Commit-type: portability-fix If the CI passes this will also require @sbalay to update the ANL tarball for OpenMPI.
Edited by Satish Balay