defined UDPQuery::~Callback explictly, making it virutal in order to avoid...
defined UDPQuery::~Callback explictly, making it virutal in order to avoid getting the "non-virtual destructor" warning from a certain version of gcc. It caused buildbot failures, and I confirmed the fix on sol-10.lab, so committing it to trunk directly without having an explict review. The fix should be quite trivial. git-svn-id: svn://bind10.isc.org/svn/bind10/trunk@3905 e5f2f494-b856-4b98-b285-d166d9295462
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