logrotate: fix g{,un}zip hardcoded path, better default conf.

srcpkgs/logrotate/files/logrotate.conf

@@ -7,7 +7,7 @@ weekly
 rotate 4
 
 # restrict maximum size of log files
-#size 20M
+size 512k
 
 # create new (empty) log files after rotating old ones
 create
@@ -15,6 +15,15 @@ create
 # uncomment this if you want your log files compressed
 compress
 
+# Do not rotate logs if they are empty
+notifempty
+
+# Do not send emails
+nomail
+
+# Do not panic if log missing
+missingok
+
 # Logs are moved into directory for rotation
 # olddir /var/log/archive