win32 compile fix (#warning)
win32 compile fix (#warning)

bitshares/bitshares-2,abitmore/bitshares-2,pmconrad/graphene,abitmore/bitshares-2,oxarbitrage/bitshares-core,bitshares/bitshares-2,oxarbitrage/bitshares-core,oxarbitrage/bitshares-core,pmconrad/graphene,abitmore/bitshares-2,bitshares/bitshares-2,pmconrad/graphene,abitmore/bitshares-2,oxarbitrage/bitshares-core,pmconrad/graphene,bitshares/bitshares-2