openwrt: don't build ALL packages
While the core images etc are not reproducible, there is little point to excessively build packages. It takes a long time and currently even crashes the build entirely. Disable it for now and add a second role later which actually rebuilds packages from community feeds. Signed-off-by: Paul Spooren <mail@aparcar.org> Signed-off-by: Holger Levsen <holger@layer-acht.org>