Added a virtual dtor to InternalLoggingEvent so that it can be extended.
Added a virtual dtor to InternalLoggingEvent so that it can be extended.

hunter-packages/log4cplus,hunter-packages/log4cplus,ccpaging/log4cplus,ccpaging/log4cplus,ccpaging/log4cplus,csuideal/log4cplus,csuideal/log4cplus,ccpaging/log4cplus,hunter-packages/log4cplus,hunter-packages/log4cplus,csuideal/log4cplus,csuideal/log4cplus