Fixed VS x64 warnings in flexbuffers.h
Fixed VS x64 warnings in flexbuffers.h

chenkai036/flatbuffers,chenkai036/flatbuffers,FrankStain/flatbuffers,chenkai036/flatbuffers,jekinchen/flatjni,zarianw/flatbuffers,SinbadFreedom/FlatBuffer,pjulien/flatbuffers,evolutional/flatbuffers,FrankStain/flatbuffers,stewartmiles/flatbuffers,chenkai036/flatbuffers,evolutional/flatbuffers,google/flatbuffers,google/flatbuffers,jasonstubbs/flatbuffers,stewartmiles/flatbuffers,rw/flatbuffers,jekinchen/flatjni,pjulien/flatbuffers,alexames/flatbuffers,alexames/flatbuffers,google/flatbuffers,FrankStain/flatbuffers,MiCHiLU/flatbuffers,chenkai036/flatbuffers,pjulien/flatbuffers,pjulien/flatbuffers,jekinchen/flatjni,alexames/flatbuffers,evolutional/flatbuffers,hgl888/flatbuffers,jekinchen/flatjni,rw/flatbuffers,rw/flatbuffers,alexames/flatbuffers,royalharsh/flatbuffers,pjulien/flatbuffers,zarianw/flatbuffers,FrankStain/flatbuffers,stewartmiles/flatbuffers,endorph-soft/flatbuffers,rw/flatbuffers,hgl888/flatbuffers,jekinchen/flatjni,google/flatbuffers,MiCHiLU/flatbuffers,MiCHiLU/flatbuffers,DavadDi/flatbuffers,google/flatbuffers,rw/flatbuffers,google/flatbuffers,royalharsh/flatbuffers,DavadDi/flatbuffers,jekinchen/flatjni,royalharsh/flatbuffers,evolutional/flatbuffers,DavadDi/flatbuffers,evolutional/flatbuffers,google/flatbuffers,google/flatbuffers,stewartmiles/flatbuffers,zarianw/flatbuffers,alexames/flatbuffers,zarianw/flatbuffers,evolutional/flatbuffers,royalharsh/flatbuffers,endorph-soft/flatbuffers,chenkai036/flatbuffers,rw/flatbuffers,evolutional/flatbuffers,hgl888/flatbuffers,endorph-soft/flatbuffers,evolutional/flatbuffers,alexames/flatbuffers,evolutional/flatbuffers,jasonstubbs/flatbuffers,jekinchen/flatjni,SinbadFreedom/FlatBuffer,royalharsh/flatbuffers,stewartmiles/flatbuffers,google/flatbuffers,hgl888/flatbuffers,alexames/flatbuffers,chenkai036/flatbuffers,DavadDi/flatbuffers,stewartmiles/flatbuffers,jasonstubbs/flatbuffers,alexames/flatbuffers,alexames/flatbuffers,evolutional/flatbuffers,stewartmiles/flatbuffers,evolutional/flatbuffers,MiCHiLU/flatbuffers,endorph-soft/flatbuffers,endorph-soft/flatbuffers,pjulien/flatbuffers,alexames/flatbuffers,SinbadFreedom/FlatBuffer,stewartmiles/flatbuffers,rw/flatbuffers,endorph-soft/flatbuffers,alexames/flatbuffers,chenkai036/flatbuffers,FrankStain/flatbuffers,SinbadFreedom/FlatBuffer,google/flatbuffers,FrankStain/flatbuffers,SinbadFreedom/FlatBuffer,pjulien/flatbuffers,rw/flatbuffers,DavadDi/flatbuffers,rw/flatbuffers,MiCHiLU/flatbuffers,endorph-soft/flatbuffers,SinbadFreedom/FlatBuffer,zarianw/flatbuffers,evolutional/flatbuffers,endorph-soft/flatbuffers,jasonstubbs/flatbuffers,jekinchen/flatjni,jasonstubbs/flatbuffers,alexames/flatbuffers,jasonstubbs/flatbuffers,royalharsh/flatbuffers,stewartmiles/flatbuffers,MiCHiLU/flatbuffers,google/flatbuffers,google/flatbuffers,FrankStain/flatbuffers,stewartmiles/flatbuffers,rw/flatbuffers,google/flatbuffers,pjulien/flatbuffers,royalharsh/flatbuffers,evolutional/flatbuffers,alexames/flatbuffers,SinbadFreedom/FlatBuffer,royalharsh/flatbuffers,DavadDi/flatbuffers,alexames/flatbuffers,SinbadFreedom/FlatBuffer,alexames/flatbuffers,zarianw/flatbuffers,pjulien/flatbuffers,endorph-soft/flatbuffers,jekinchen/flatjni,stewartmiles/flatbuffers,royalharsh/flatbuffers,jasonstubbs/flatbuffers,MiCHiLU/flatbuffers,stewartmiles/flatbuffers,jekinchen/flatjni,jasonstubbs/flatbuffers,chenkai036/flatbuffers,google/flatbuffers,pjulien/flatbuffers,zarianw/flatbuffers,royalharsh/flatbuffers,google/flatbuffers,rw/flatbuffers,pjulien/flatbuffers,zarianw/flatbuffers,hgl888/flatbuffers,chenkai036/flatbuffers,pjulien/flatbuffers,FrankStain/flatbuffers,stewartmiles/flatbuffers,rw/flatbuffers,endorph-soft/flatbuffers,hgl888/flatbuffers,MiCHiLU/flatbuffers