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rcpu: make sure not to leak /env/fn#server and /env/fn#aanserver for drawterm (thanks mischief)

--- a/rc/bin/rconnect

+++ b/rc/bin/rconnect

@@ -60,9 +60,9 @@

 			rfork n

 			fn server {

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

+				rm -f /env/^('fn#server' 'fn#aanserver')

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

 			}

-			rm -f /env/^'fn#aanserver'

 			exec tlssrv -A /bin/rc -c server

 			exit

 		}

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

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

@@ -3,6 +3,7 @@

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

 fn server {

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

+	rm -f /env/'fn#server'

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

 }

 exec tlssrv -a /bin/rc -c server