send missing gmap key to stderr.

Reference: /n/atom/patch/applied2013/gmapstderr
Date: Wed Jul  3 17:38:42 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /rc/bin/gmap	Wed Jul  3 17:38:25 2013
+++ /rc/bin/gmap	Wed Jul  3 17:38:25 2013
@@ -6,7 +6,7 @@
 	if(~ $#gmapkey 0)
 		gmapkey = `{cat /lib/gmapkey}
 	if(~ $#gmapkey 0){
-		echo goto http://code.google.com/apis/maps/signup.html and get a google maps key (free)
+		echo 'goto http://code.google.com/apis/maps/signup.html and get a google maps key (free)' >[1=2]
 		exit 'no key'
 	}
 }