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tcp17019: make service proto and netdir arguments optional (for aux/listen1)

this allows /rc/bin/service/tcp17019 to be called from
aux/listen1 without arguments like:

aux/listen1 tcp!*!rcpu /rc/bin/service/tcp17019

--- a/rc/bin/service/tcp17019

+++ b/rc/bin/service/tcp17019

@@ -1,8 +1,10 @@

 #!/bin/rc

-netdir=$3

-remote=$2!`{cat $3/remote}

+if(~ $#* 3){

+	netdir=$3

+	remote=$2!`{cat $3/remote}

+}

 fn server {

-	echo -n $netdir $remote >/proc/$pid/args

+	~ $#remote 0 || echo -n $netdir $remote >/proc/$pid/args

 	rm -f /env/'fn#server'

 	. <{n=`{read} && ! ~ $#n 0 && read -c $n} >[2=1]

 }