Analog to how we handle custom feeds in opkg, add a customfeeds.list for
custom package feeds and mark it as a configuration file.
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/16940
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
