use gzipped package lists

SVN-Revision: 12849

package/opkg/files/opkg.conf

@@ -1,4 +1,4 @@
-src snapshots http://downloads.openwrt.org/snapshots/$S/packages
+src/gz snapshots http://downloads.openwrt.org/snapshots/$S/packages
 dest root /
 dest ram /tmp
 lists_dir ext /var/opkg-lists