address: Fix endianess problem when fetching octets in IPv4 addresses
The packaged 0.9.18 fails tests for s390x, as 10.0.0.0/32
becomes an 10.0.0.0.in-addr.arpa.
, instead of expected 0.0.0.10.in-addr.arpa.
Upstream: afc5330f56d74b4a9142b800d994d623d7cd29e8