[cmake] auto choose readline library (#6251)
[cmake] auto choose readline library (#6251)


jwhui/openthread,srickardti/openthread,openthread/openthread,jwhui/openthread,openthread/openthread,jwhui/openthread,srickardti/openthread,abtink/openthread,srickardti/openthread,abtink/openthread,openthread/openthread,srickardti/openthread,abtink/openthread,jwhui/openthread,openthread/openthread,abtink/openthread