we never run the tests (they fail or take too long or create files too big) but still build them which also uses ~2GB of disk space and can lead to build failures when disk quota is tight.

Pull request is here: https://github.com/EinsteinToolkit/ExternalLibraries-HDF5/pull/4

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2559/hdf5-disable-building-test-executables-and