[otns] allow build without JOINER=1 (#5120)
[otns] allow build without JOINER=1 (#5120)


librasungirl/openthread,lanyuwen/openthread,chshu/openthread,abtink/openthread,librasungirl/openthread,lanyuwen/openthread,chshu/openthread,abtink/openthread,chshu/openthread,lanyuwen/openthread,jwhui/openthread,srickardti/openthread,bukepo/openthread,srickardti/openthread,librasungirl/openthread,jwhui/openthread,srickardti/openthread,openthread/openthread,openthread/openthread,bukepo/openthread,lanyuwen/openthread,abtink/openthread,jwhui/openthread,abtink/openthread,chshu/openthread,bukepo/openthread,chshu/openthread,openthread/openthread,lanyuwen/openthread,bukepo/openthread,jwhui/openthread,librasungirl/openthread,lanyuwen/openthread,srickardti/openthread,chshu/openthread,openthread/openthread