Fixed build error on VS 2013
Fixed build error on VS 2013

unsigned __int64 ~= unsigned long long.  VS2013 will error.
kypp/flann,egtann/flann,atulkum/flann,saedrna/flann,atulkum/flann,egtann/flann,atulkum/flann,egtann/flann,atulkum/flann,kypp/flann,saedrna/flann,egtann/flann,saedrna/flann,saedrna/flann,kypp/flann,atulkum/flann,saedrna/flann,kypp/flann,atulkum/flann,egtann/flann,egtann/flann,kypp/flann,kypp/flann,saedrna/flann