DBoW: ScoringObject.h fix undefined behavior upon dtor #61
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Fixes:
ORB_SLAM/Thirdparty/DBoW2/DBoW2/TemplatedVocabulary.h:529:3: warning: deleting object of abstract class type ‘DBoW2::GeneralScoring’ which has non-virtual destructor will cause undefined behaviour [-Wdelete-non-virtual-dtor]