d/rules: replace deprecated json configure

Andreas Hasenackrequested to merge
ahasenack/bind9:deprecated-json-configure into debian/main

As can be seen in the build logs at https://buildd.debian.org/status/fetch.php?pkg=bind9&arch=amd64&ver=1%3A9.16.4-1&stamp=1592427938&raw=0:

Unrecognized options:
    --disable-silent-rules, --disable-dependency-tracking, --enable-threads, --with-gost, --with-libjson-c, --with-atf, --enable-ipv6, --enable-rrl, --enable-filter-aaaa

--with-libjson-c is not recogznied anymore. We should be using --with-json-c nowadays:

  --with-libjson          deprecated, use --with-json-c
  --with-json-c           build with json-c library [yes|no|detect] (default
                          is detect)

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