shairport-sync: update to latest version
- update to latest (2.4.1) version
- add support for config files
- switch uci to config files
- based on https://github.com/openwrt/packages/pull/1815
- merge maintainers
- add openssl/polarssl build variants
Signed-off-by: Mike Brady <mikebrady@eircom.net>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>