BIND 10 #2593: Using old versions of boost::optional fails with GCC 4.4.x and above

[BIND 10 Development]

#2593: Using old versions of boost::optional fails with GCC 4.4.x and above
-------------------------------------+-------------------------------------
                   Reporter:  muks   |                 Owner:  UnAssigned
                       Type:         |                Status:  new
  defect                             |             Milestone:  Next-Sprint-
                   Priority:         |  Proposed
  medium                             |              Keywords:
                  Component:         |             Sensitive:  0
  libdns++                           |           Sub-Project:  DNS
               CVSS Scoring:         |  Estimated Difficulty:  0
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 Using old versions of boost::optional fails with GCC 4.4.x and above. This
 was discovered on our Debian i686 builder. Please see the discussion here:
 https://lists.isc.org/pipermail/bind10-dev/2012-December/004189.html
 https://lists.isc.org/pipermail/bind10-dev/2013-January/004191.html

 We have to detect it, or require a new version of boost when `configure`
 runs.

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Ticket URL: <http://bind10.isc.org/ticket/2593>
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