Instead of using http and https for source downloads from
downloads.openwrt.org, always use https for it's better security.
Signed-off-by: Paul Spooren <mail@aparcar.org>
This drops kernel version switches for versions not supported by
OpenWrt master at the moment. This only adjusts local code, but
doesn't touch patches to existing external packages.
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>