Use 'rdma-core-devel' not 'libibverbs-devel' for dependencies
    
    rdma-core-devel Provides: libibverbs-devel, but it does not
    Provides: libibverbs-devel%{_isa}, which hwloc-devel wants to
    depend on; it *does* provide rdma-core-devel%{_isa}, so let's
    just switch to that name.