Status now sent with gzip - libbpf bumped to v1.5.0

Status is now requested gzipped; large configurations lead to huge JSON documents being requested every couple of seconds, meaning many Mb/s of data being consumed when idly watching the status page. This should reduce the bandwidth consumed to a couple of percent of that which was used before.

This might prevent some nasty surprises on mobile phone roaming bills (in future :-/ ...)