Now enable the "Guard" class in single-threaded builds.
Now enable the "Guard" class in single-threaded builds.

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