dns/dnsmasq-devel: update to rc5

CHANGELOG diff vs. rc3:

  Optimise reading large numbers of --server options. When re-reading
  upstream servers from /etc/resolv.conf or other sources that
  can change dnsmasq tries to avoid memory fragmentation by re-using
  existing records that are being re-read unchanged. This involves
  seaching all the server records for each new one installed.
  During startup this search is pointless, and can cause long
  start times with thousands of --server options because the work
  needed is O(n^2). Handle this case more intelligently.
  Thanks to Ye Zhou for spotting the problem and an initial patch.

  If we detect that a DNS reply from upstream is malformed don't
  return it to the requestor; send a SEVFAIL rcode instead.