Fix Boost library directory detection to work properly when both debug and optimized libraries are found.
Fix Boost library directory detection to work properly when both debug and optimized libraries are found.

sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata