Fixed compilation error under Windows
Fixed compilation error under Windows

Gjacquenot/simbody,simbody/simbody,Gjacquenot/simbody,chrisdembia/simbody,robojukie/simbody,elkingtonmcb/simbody,scamille/simbody,simbody/simbody,chrisdembia/simbody,robojukie/simbody,elkingtonmcb/simbody,scamille/simbody,Gjacquenot/simbody,chrisdembia/simbody,robojukie/simbody,elen4/simbody,elkingtonmcb/simbody,scamille/simbody,elen4/simbody