adjust ExclusiveArch: build exceptions
    
    After upstream 1315d44 ("Use shift rather than crc for hashing.")
    memkind dropped its dependency on SSE4.2 instructions in order
    to compute thread local storage hashing, thus we can amend
    other 64-bit arches to the ExclusiveArch exception
    
    Signed-off-by: Rafael Aquini <aquini@redhat.com>