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Building against RHEL 8 requires libtirpc-devel, as with fedora 28. Add rhel8 and centos8 options to the test, to account for that. BuildRequires Originally added for fedora 28 via commit 1a62a305be01972ef1b81469134faa4937836096 Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: George Melikov <mail@gmelikov.ru> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #9289