ports/74460: Update port: shell/rc to 1.7.1

[Serge Gagnon]

Close this PR please because it crash if build WITH_READLINE .
http://www.freebsd.org/cgi/query-pr.cgi?pr=74460

Thanks

-- 
Serge Gagnon <ser_gagnon at sympatico.ca>
Quebec, Qc, Canada